Hi, displacement was about 40lbs if I remember correctly, the battery was 14 of that. There was space for another battery but it ran for two hour at full speed so I never fitted second battery. The copper tube is actually phone cable for the lighting. Its woodstained to blend in. The planking was individually sanded strips of 1/32 ply over the 1/4 ply decking. The speed controller was the original golf trolley one, with a hacked 1/4 scale servo to turn the golf trolley knob 180 degrees. I also included a fan as I wasnt sure if the trolley speed control would overheat. It didnt, and would never have done, it drew 8 amps at full throttle, whether the prop was in the water or not. The bar, stairwell, rear cabin and wheel house were all lit, and switched from tx. I had to sell it, due to the small people. Lol. I sold it with a radio set that cost me £250, so I basically got 150 for all the rest. Then my wife said, 'I liked that one, why did you sell it?.......
Ah well. I really enjoyed the build. I may make another smaller one. I have made a smaller Vic Smeed Rorqual as I had made a full size one years ago, still to be completed (this year, definately! Lol)