The other day I remembered about an idea I had for a map way back in Halo 3. This idea never worked in Halo 3 because it just wasn't possible with the items available in that version of forge. But, I'm curious to see if it could be done with Halo Reach. Basically, I wanted to make a rotating floor (Any shape as long as it works). I simply cant seem to do it, so if anybody wants to give a whack at it, it would be greatly appreciated. If it can be done, I'm dying to see what a map based around it would play like. If somebody is able to do it, of course, I will be more than happy to make sure you get the credit for it when I post the map.
I am 90% certain that all objects in Forge are going to be entirely static, or if they can move, it will be unpredictably.
The largest object that can remain movable in custom games is a crate which is hardly larger than a Spartan. There's just no way this would be possible.
4 crates spun by man cannons could provide a small spinning platform. Then you could create more small platforms instead of one large one. Keep in mind it wont rotate the way your facing just move you around.