my main concerns are:
waterproofing the hull to stop instant sinking.
stoping the ingress of water whilst under way to prevent slow painful sinking.
The installation of RC, making holes in hull for propulsion(leading to stealth sinking)
I have no experience of any kind of RC installions and would appreciate pointing to the absolute idiots guide(hmm this seems to lack the fear of sinking)
to answer your questions
1 - you stop it sinking by waterproofing the hull and adding polystyrene foam as buoyancy.
2 - if you can't easily waterproof a hatch you might elect to seal everything inside and just have a single drain hole and a socket to recharge the batteries...
3 - you can disassemble cheap servos and use their motors (still attached to the electronics) as drive motors. This makes for a very light installation.
4 - an idiots guide to R/Cing would probably say 'Don't start with that kind of plastic model...". I'm not too sure how big it will be, but if it's around 2ft with a beam of 4" it is rather small, hard to waterproof, hard to ballast to the correct waterline, probably won't look that realistic, will lose all the detail in short order due to handling, and will probably be pooped by a ripple. Small models of this kind are best attempted once you have a bit of experience. But, having said that, there are some quite good models on youtube....
How important is accuracy under the waterline? It would easier to make a single propeller model with a very unscale prop...
