>What's the common thinking about making the main spar one piece? > >?????? Putting all comments aside re: WAFs, the main problem as I see it is the problem of space.
1, Enough room to build and store the spars. 2, Once the spars are fitted to the boat, turing the boat over and just working around the project. 3, Trasporting the finished plane to the airport. If you can solve these problems and I am sure many others then have a go, it is your plane. Karl