One thing I will say about melee combat is that you'll most assuredly be better off if you actually have a melee weapon to use in combat, like a blade.  You are piloting a giant mechanical contraption so 'hand-to-hand' combat could occur, sometimes without a weapon, but unless your Mecha is actually designed to deal damage with it body, it will mostly be a defensive measure.  On another note I kinda was always a fan of the mobile armors, with their varying design and specific strengths.  When I get around to making character sheets I'm not too worried about what 'type' of mecha you make though of course there will be limits to what they can do.  I'll certainly be expecting them all to have certain _strengths_ and _weaknesses_.