Centurion Mini Brushless catamaran spare parts

I am going to stick a bit of foam in the hull when I get mine. Might be a good idea to put some foam on the cover as well, or will it float?

S-man,
Sorry to say but it may be a case of having to make one yourself. I don't know how good your diy. skills are? but if you obtain a piece of fibreglassing foam and shape it to fit the boat. This foam is very easy to shape with hand tools and sandpaper. When you are happy with the piece have a shop glass over it for you as it may not be worth it to buy the resin etc to do such a small piece. By doing it this way the finish is not as good as it would be if came out of a mould but more cost effective.
Good luck.