I redid some rooms and got rid of a few weapons and half of the equipment.
This Map is named after the Cube (cube = regular Hexahedron) I have as a center piece. The walls are raised enough so you cant jump out. great for free for all and team slayer.

Download Link
Bungie.net : Halo 3 File Details

Weapons
Battle Rifle x5
Shotgun x1 (90 second respawn)
Sniper Rifle x1
SMG x2
Spiker x2
Needler x1
Brute Shot x1
Rocket Launcher x1 (2 minute respawn)
Mauler x1

Equipment
Spike Grenade x6
Firebomb Grenade x1
Bubble Shield x1
Regenerator x1
Deployable Cover x1
Active Camo x1

http://img171.imageshack.us/i/dotshalo3115026982mediu.jpg/
Overview of the map.

Blue Dot: 3rd Building's top floor
Teal Dot: 3rd Building's 2nd floor
Green Dot: Green Room
Pink Dot: Shotgun Room
Purple Dot: 2nd Building's top floor
Grey Dot: 1st Building
Red Dot: Rocket Ramps

http://img36.imageshack.us/i/halo3113153393medium.jpg/
The Cube.

This is the center-piece to the map. The active
camo spawns in the center of the cube. You can
jump on top of the cube from the South Deck
and from the Rocket Ramps.

http://img413.imageshack.us/i/halo3115039113medium.jpg/
Top floor of the 3rd Building (Blue Dot).

This Room is what the Spiral Ramp leads to. The
Bubble Shield spawns on the spiral ramp. To the
left is the blacony that looks over the Green room
An opening between the 3rd and 2nd level of this
building lets you drop down to the bottom floor.

http://img824.imageshack.us/i/halo3113200297medium.jpg/
2nd floor of the 3rd building (Teal Dot).

Gravlifts from bottom floor lift you up to here.
Dual spikers spawn next to the column and a doorway
leads out to the South Deck.

http://img97.imageshack.us/i/halo3115024070medium.jpg/
The South Deck.

The South deck looks over the open area where
the Cube is. It connects the 2nd and 3rd levels
of the 3rd building together aswell. a ledge on
right was added in to allow you to jump up to the
deck from the bottom. Sniper spawns here on left.

http://img821.imageshack.us/i/halo3115031497medium.jpg/
Bottom of 3rd building.

Looking towards the Spiral Ramp that leads to top
floor. Brown guy is running under the opening that
you can drop down from the upper levels.

http://img256.imageshack.us/i/halo3113199913medium.jpg/
Another shot of the bottom of the 3rd building.

Gravllifts in back take you to 2nd floor. A doorway
on the right takes you into the Green Room.

http://img687.imageshack.us/i/halo3115025500medium.jpg/
3rd buildings balcony.

This balcony is on the 3rd level of the 3rd building
It is looking over the Green Room and Shotgun
Room (where the dead purple guy is). North Deck
and 2nd Building are seen in the back where the
other purple guy is shooting from (block under him
was added to allow you to jump up to the deck).

http://img715.imageshack.us/i/halo3115031356medium.jpg/
Green Room (Green Dot).

This room connects the shotgun room and the
3rd building. It also has a doorway that leads to
the main open area. Dual SMG spawn in here and
so does the regen. Added in a block to allow you
to jump up to the balcony in the 3rd building.

http://img204.imageshack.us/i/halo3115031048medium.jpg/
Shotgun Room (Pink Dot).

This is where the shotgun spawns. It links to the
Green Room and the 2nd Building's top and bottom
floor. I changed what the shotgun spawns on from
an arch to 2 fins. window across from shotgun that
you can jump or shoot through.

http://img812.imageshack.us/i/halo3115027258medium.jpg/
Bottom of 2nd Building.

This is where the Bruteshot spawns. there is a hall
in the back that leads to the 1st building. opening
on the left allows you to drop down from top floor.

http://img692.imageshack.us/i/halo3113200078medium.jpg/
Top of 2nd Building (Purple Dot).

The Needler spawns in back right corner. in the
back left corner there is a teleporter that takes
you under the spiral rimp in the 3rd building. a
doorway on the left takes you out to the north
deck.

http://img714.imageshack.us/i/halo3115026856medium.jpg/
North Deck.

This connects the 2nd and 1st building.
Underneath is a hall that leads to the back
hallway. Window under the deck shows the
new room I added to the 1st building. Deployable
Cover and Firebomb spawn up here.

http://img291.imageshack.us/i/halo3115025831medium.jpg/
1st Building (Grey Dot).

This room opens into the main area and is linked
to the 2nd building by the North Deck and the
Back Hallway. I added a room that leads down
to where to maulers new spawn is. I also added
in 2 columns by the entrance to spice up the room.
A small opening lets you jump out into the back
hallway. The Brown Guy is jumping towards the
entrance to the back hall.

http://img14.imageshack.us/i/halo3115043408medium.jpg/
The Back Hallway.

This links the 1st and 2nd building together.
The ramp where the BR is takes you to the
1st building. You can take a left and go out
into the main area. The opening where the
Brown Guy is jumping out is where the mauler
room that i added is located.

http://img806.imageshack.us/i/halo3113200118medium.jpg/
Rocket Ramps (Red Dot).

This ramp is where the rocket spawns.
I added a small wedge so you can jump
on to the top of the cube.

Download Link
http://www.bungie.net/Online/Halo3UserContentDetails.aspx?h3fileid=115029878

I hope you like the changes (if you've played the older versions).
Please play the map before you bash it. otherwise comment away, share your thoguhts.

I am currently working on a remake of my cave map (Galvin's House) and a tilted map.