My friend and I Forged a Paintball Arena not to long ago. However, we set it up with standard weaponry for standard gameplay. I suggest doing this for your map. Make it so those Man-Cannons are visible but not accessible with normal gravity, and add a weapon set. This helped us because the map played amazingly for paintball and amazingly for standard Halo gaming, rather than being restricted to only the mini-game.
i like your suggestions. if you want to help out with weapon placement and spawns that would be great. possibly make it a v2 of the map.
No prob, bro. I'll be glad to help. I need a break from our current project anyways. I've been on it since 9:00 this morning. I've taken one 1-hour break haha. 11 hours of Forging FTW! FR me. My GT is beingTOOnosey.