Vic smeed "sea rider" X 1.5, fits in household bath for balasting, easy to make and fit out, simple 2 channel, very stable and dry boat that looks good on the water. Lots of room inside for stuff like navy lights, rotating radar, depth charges etc. etc. etc....
Other basic boat free plans in mags etc...
HMS romper free plan is slightly more "involved" needing thought for "deck seal" and more detail, but looks great on the water, x1.5 scale.
I made mine from materials liberated from a skip.
Want one ( sea rider or romper ) ? , complete, just add batteries...?
Ideal first venture in boat making/using...
Enjoy.