Hey Aristo - I'm interested in joining, which I'm sure doesn't surprise you at all. I remember the original Mobile Frame, and I enjoyed that a lot. Your mecha also remind me quite a lot of the GEARs from my game of the same name. I like the setting too, making it a 'sidestep' from reality really appeals to me a lot. 
I'd love to join in if you'll have me, although I do want to make the point that I may be slow to reply at times, or not as active as some players, due to my schedule and other hobbies also taking up my time. However, I will always try to deliver high quality posts at least. 
I'd really like to get into something as a player, and your game is the first thing I've seen in a long time that really interests me!