*EDIT*
PICTURES AND QUOTES FIXED.

Ah, hey. This is my first post on these forums so please excuse anything I may mess up on in this post.

So, after my gaming pc basically exploded in mid-game and now gets a BSOD on start up, I got more into my 360. I started playing my older games, and eventually popped in Halo 3 :D. Being a long time gmod and bf2:sbx mod player, I immediately jumped into Forge. The following is my original post regarding the outcome of my newly developed forge addiction on the moepgaming forums. Please read it all before download:

Before I explain it, I should probably say that LifeSim V1 the map and LifeSim V1 the gamemode are both availabe on my Halo 3 fileshare. My gamertag is Andokool12. Both are made entirely by me.
If you've ever played DarkRP in gmod, and you played it enough to know how it works, you will understand how LifeSim works.
For the rest of you, I shall explain it.
LifeSim is a gamemode for Halo 3 based off of the Slayer game mode. There is an unlimited time limit, no kills are counted as points, there are no points. Walking is set to a realistic speed, as is jumping (except height instead of speed). All players start with a magnum and only a magnum. Health is set to a minimum. Ammo is infinite due to the circumstances.
Now, I will go over how the game is played/the rules all the players must follow.
The players all start as civilians in the streets of the main city. Either the players have established their jobs before the game starts, or they must establish them while in game. Players may make their own jobs that do not interfere with the game too much, but the main useful jobs go as follows:
-Security (Police)
-Jail guard
-Mayor
-Judge
-Gun Dealer
The rest of the possible custom jobs/titles that are known go as follows:
-Gang leader
-Gang member
-Hitman
-Village leader
-Village member
Now before I show the pictures, I'll go over the rules:
1. All players must show maturity and show respect for other players. LifeSim is not ANY kind of fighting mode. As far as I know it is the first of it's kind.
2. No power playing. If you kill someone, the police will come after you. If you are stopped by a policeman at gunpoint, DO NOT FLEE.
3. When you are arrested, the policeman should bring you to a jail cell. You will follow him wihout hesitation. If you believe you deserve not to go to jail, reqyest to plead your case in the courtroom. If there is nobody acting as the judge, the next most powerful player is chosen to be the judge.
4. All policemen are required to be fair. Don't act like a badass cop you saw on COPS. You only fire when you or another player is in danger.
5. Despite what your job may be, nobody is above the law. Hired guns (Hitmen) can not resist arrest "Because they killed someone they were requested to kill". Their job is still illegal
6. No, there is no money in the RP, that's why most of these rules are here.
7. If you are the gun dealer, your shop is in the low-life area of the main city (the back of the town) behind the giant ""B<-" sign. There is an smg, assault rifle, battle rifle, and sniper rifle back there. These are your "shipments". When a player wants a gun, he requests one from you. You lead him in the back of your shop, and he picks up the one he wants. You are the only non-policeman permitted to shoot during certain circumstances. You are permitted to shoot your customer if he takes more than one gun or plays around with them. Anything other than getting the one he wants and then leaving. Remember, your gun shipments only respawn every 30 seconds. This is to account for the lack of a currency system in the game.
8. If you are a jail guard, you're job is to guard the prisoners from escaping, although if they are responsible players they should need someone to guard them. The maximum time a prisoner may spend in jail is 60 seconds. Both the guards and the prisoners are asked to be aware of the time spent in their cell.
9. If you are a prisoner, you MUST stay in your cell for your set time. Your gun is not your ticket out. Your only ticket out is when your sentence has been served.
10. NEW LIFE RULE. If you are killed, you come back to life without knowledge of who killed you, or knowledge that you were killed at all.
I think that's about all of it... Pictars comin tru!
View of the whole tribe from the head of it.
View of the courtroom from the entrance.
View of the jail cells.
View of the main city from overhead. Notice the soccer field beside the city ;).
The gun shop.
ZOMFGA DON'T LET THAT BALL INTO DAT NET!
PLANS FOR V2:
-Permanent holding cell for the idiots that shouldn't be playing LifeSim.
-Removal of the doors I placed preventing access to the back hallways of Foundry to add something there... Dunno what I should add there yet, though.
-ACTUAL classes...? (Teams for each job... It's possible...)
Known Glitches:
-Two gunshops D: (In the larger building beside the gunshop shown in the screenshot (to the south-west of the middle of the picture) I placed guns there as well by accident. Will be fixed in V2.
-Guns don't respawn 30 seconds after being picked up. They respawn 30 seconds after the person who picked them up died. I think I will leave it this way.
-A few structures aren't properly aligned (Small, barely noticeable cracks in roofs, etc...). Will fix what I can in V2.
-The majority of regular Halo players are young and too immature to properly play roleplay, so finding others to play with might be a daunting task. Unfixable, sorry.
Add me on XBL, I'd be happy to play with you/give you an in-game walkthrough.
No I'm not a huge Halo 3 fan, or much of a fan at all. While my pc is in a coma (bsod on start up about paged files...) I decided to try some of my older 360 games as a break from Oblivion. I played CoD4 for a while (:D) and then started playing custom games with some guys on my friends list from the pre-mappack halo days. We played absolutely amazing custom games and maps. For example, a perfectly well done Assassin's Creed mode, where one team (the assassins) must kill the other team (crusaders), while the crusaders must attempt to hide/kill the assassins in defense. We played this on a 10/10 forge map called "Assassin's Creed". It was a fully working ancient city. A church, streets, a fountain, towers, etc.
Uber.
If you know what you're doing, Forge is just about equivalent to bf2 sandbox mod.

Both the game mode and map itself can be found in my file share, here:
Bungie.net : Halo 3 File Share
Although after taking a closer look at those rules, here's the direct link to my map:
http://www.bungie.net/Online/Halo3UserContentDetails.aspx?h3fileid=76078068
And here's the direct link to the gamemode for the map:
http://www.bungie.net/Online/Halo3UserContentDetails.aspx?h3fileid=76078116

If you are a mature individual and can go by the honour system without problems, you will most likely enjoy this. No, this is not an "RPG". Don't let the fact that it's an "RP" throw you off. For example, most gmod players who are into RP don't actually like rpgs in any way. The majority of them start it at first thinking "wth this is going to be dumb rping sounds lame" and turn out to be addicts.

I have absolutely NO idea if RPing can become successful in H3, but before we find out we have to try it. Here's the attempt, enjoy!