I think this is an awesome idea. Props for taking the time to try and make this work.
This has great potential to be an awesome game IMO. And I'm really liking the mechbox swap thing. Everybody just takes their favorite upgraded mechbox over to the game, and swaps it into a suitable gun. Even switching to a tight bore would only take minutes. You could easily swap a mechbox on most guns in under half an hour. I dont know what your local fields are like, but if you could get a MOUT course like the "Irene's", that would just kick ass. Most Canadians will never get to experience that.