G´day all,
have been doing a bit on the centre section, I made up a false spar, 3mm aircraft grade ply, had to do it in 2 pieces, I doubled up the centre join, I glued them in with some thickened West System Epoxy, then bits of Fibre Glass matt around the edges, clamped it all together, looks rough, but I dont think it will fall apart, then I put a layer of Glass on the inside of the skin, wherever I could get to, the glass isnt an exact fit, the idea was just to strengthen what I could get to. next is to wet the inside of the spar then stuff more glass into the gap.
cheers, Oldtimer.