Spiff...is that an offer?

I'm just wondering if I can actually make a working config out of my first love, the Battlemaster. I had no idea so many classic designs were going to be available once I installed the mek tek paks!
Anyways, I got it all loaded, and started playing around on the Banzai Bootcamp ranges to hone some sorely lacking skills (like hitting things that are actually moving) and dealing with that miserable video lag (STILL don;t know what's up with that!) , when I ran across another minor issue; how does one activate the repair and rearm bays?
After playing in the mosh (brawl) pit with an CLBX20 (x2) and :CLBX 10 and 3 sml laser Thanny, I managed to kill the mech I chose to fight and the three others I acidentally activated with stray shots (blasted mad cat, took FOREVER to go down, but the good news is the flea managed to go down in two alphas, which to my way of thinking should have been one, but oh well) I was pretty chewed up. I went to every mech repair bay I could find but had no idea how to activate it. That's not an F-key funciton is it? How can I get patched upo without exiting the camp?
Thanks again.
PS are those classic designs even worth playing around with or are they just there for old farts like me who had 20 sided dice made out of granite?