Good luck you have a big task ahead of you.. I think the batteries are your limiting point . you can use batteries in series or parallel.depends on voltage and amp needs..in order to do dual motor than can turn boat you will want to use 2 esc with radio mixing. best of luck. the rx gets voltage from esc bec. if you run 2 you will want to disconnect center wire on 2nd esc(+ wire) . cant run 2 becs into rx