One thing you need to remember with Electric is you need to be able to seal that hatch so its completeley water tight.I think Brushless and lipos is def the way to go,5692 motors might work,voltage is upto you, personally im going with twin 5694 1000 kv motors in my 58 Apache on 6 s moving upto 8s later problem with going upto 10 s is you then need to spend big $ on hv escs.If you choose hig voltage then go with lower kv and larger props.Thats a massive boat youve chosen to go electric on though.
Mart