Usually, kits are furnished with the hull only, along with control surfaces and the prop (if you're lucky). You'll also need the following:
-paint, glue, resins, fibreglass matte, epoxies, fillers
-minimum 4 channel radio (surface frequency) (throttle, dive planes, ballast system, rudder)
-speed controller
-failsafe system (for
when, not
if you ever lose signal)
-automatic pitch controller (highly recommended)
-battery eliminator / voltage regulator (highly recommended, especially for 12V systems)
I've got some info on my site (
www.rc-sub.com), and be sure to check the SubCommittee (
www.subcommittee.com).
You can email me at
[email protected] if you have any specific questions. I'd be happy to help you out.