Hi! Im kind of a noob in rc boats but not in rc since im semi-pro in fpv drone racing but this is new? Im planning on building about a 25? balsa/plywood catamaran? Ive got suggestions of first building the hull and then getting the electronics after becouse then you know kv of motor etc? Would need help with some things. What material should i build it with? Plywood, balsa or foam? Also is it necessary to buy a water cooled motor and what size + kv? What kind of shaft would be needed flex or not flex.