For the most part If you have any questions about Infinity, you can ask me. I ran a demo table at Origins last year and this year I'm working with an organization that is bringing demos and tournements to both Origins and GenCon this year.
I collect 4 armies, Yu Jing, Nomads, Combined Army and a bit of Pan-O (Man that Cutter is one sweet mecha), with YJ being my main (1400 points worth that I can make 4 forces out of easily).
And yes the game does require about 70% coverage, but getting a few sets of AT-43 terrain sets can help fill up space, as well as using CD stack cases, toy cars and many 'found' objects. I made some multi-story buildings out of foam board to fill up my table.