Really, I cannot see any reason why it would not be possible to get all the RC gear inside a boat of this size.. I built an Aeronaut Bella, admittedly from a kit, a few years ago and she is quite fine lined, maybe not quite as much as a Dragon, but not that far off. She was roughly the same size as your Dragon will be. She had a cockpit, but it was deliberately kept shallow and I have never had any problems with her getting water in there, ok, some water, but not enough to worry about, and if it can be made watertight, all the better. However, I do agree with Ron and think if you can fit a transparent cover over the cockpit, it would be advantageous. Anyway, best of luck with the project and I'm sure I won't be the only one watching with interest.