For this to work you need rather good drone skills, but i have that.
Basically, get a thorax and jam it full of the finest drones money can buy. But instead of kitting the rax out with guns, fit a mix of nosferatu's and remote repairers. As I understand it, NPC rats have infinate cap (the cheating swine). charge in fast, lock the least likely to die immediately and pump it for cap with your nosferatu's. As these puppies can suck out 36 units of cap each (medium tech 2's), every 6 seconds, a couple of em together would give you a fairly healthy cap boost. You then use this cap boost to keep your armour tanking going, whilst simultaneously repairing the drones. Effectively: drone tanking!
There must be something wrong with this logic, but i cant see it. If no-one can think of a problem with it, I may just give it a go.
EDIT:A quick calculation tells me that 3 tech 2 medium nosfer can keep 1 medium armour going indefinately, with some cap to spare


