Ask a moderator to move this to Halo: Reach FORGE discussion. Don't expect that you are the first person ever to think of making this exact map, there are already multiple posts there for things similar to if not replicas of this idea. Is there no end to people who cannot figure out where to post their threads?
I'm sure they'll be a MILLION maps just like this, so try to make yours first. Originality is the key, my friend...