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Allright guys this is a map I made some time back so it's not all pretty and everything, but it fills its original purpose, just to have fun.

Download
Bungie.net : Halo 3 File Details

This map only supports slayer and CTF, but you probably won't be playing anything competitive anyway.

The design of this map centers around the giant machine I have constructed on the right side of Avalanche. You hit a switch at the top and a crate is released to splatter the unlucky soul on the receiving end.
Just get your cousin or somebody to stand still on the smash platform, and destroy them! It's great fun. This is the kind of map you play on when you just want to release some steam by smashing people, nothing real competitive at all. Just have fun, people!

Pictures

The SmashMaster 3000 ready for action

The other main base, designed to mimic a normal avalanche base sans mancannon

The back of the machine. You can look through the observation window to watch the crate splatter the victims

The smash platform, where victims stand, recently been launched

The launching mechanism. I recommend shooting the fusion coil with the provided plasma pistol because if you don't, you won't get a splatter medal

OK I hope you have fun smashing people!
Remember,
the only way to get up on the machine is by teleporters from the back bottom of it. Shield doors indicate hidden teleporters, just walk into the shield door to teleport. There's also a hornet and a warthog on the map.
One more thing, the crate automatically launches on start, just wait for it to respawn. It's on 10 second respawn, but crates are just weird you never know when they'll respawn.
Have fun!