i built a remora 12 months ago,out of light ply rather than balsa with a glass fibre outer skin on the hull bottom,
fitted 3 extra rails on either side of the hull centre line,
Would liked to have gone I/C but there not allowed on our lake [ silly ]
tried a couple of brushless motors 1000 kv 300 watts 40 mm sports pitch props ,
Boat was quite nippy but not fast enough,bought a 1700 kv 650 watt water cooled brushless from Dave Marles of Prestwich
models,60 amp speed controller and a 35x prop,very fast ,
still trying different lipos,
I used to have a MFA Spearfish with a KB 40 went very well indeed but I think the Remora is just as fast and turns better without slowing down
, hope this helps ,Vic Smeed designed some great models the Remora being one of the best,