ok, an update. My bank account has a bit more money on it than I thought, so might actually be able to get something done. Then again, for the money that a controller, servo, tires, battery and charger would cost me I could buy a thunder tiger phoenix BXII rtr. And still have a bit of money left over. That's really annoying. Seriously considering the Phoenix as that way I could get started quickly and if something breaks I can rather easily order spares.
But let's get back to the cougar. The ESC needed some work. The battery cables were about an inch long and the motor cables weren't long enough either. So I bought some cables and now need to figure out whether to solder them or use something like this (not sure what the proper term is, would it be "crimp connector"?):
I do prefer not opening the ESC to solder the battery cables (don't like soldering on circuit boards, a bit afraid I'll mess up and end up having to buy an ESC as well) and using these is tempting. What do you think? Might ask a friend (who is more skilled with the soldering iron) to replace the battery cable on the circuit board and use crimp connectors for the motor.
Also looking for ideas on layout. Longitudinal placement of the batteries seems to be preferred?