We used 18mm marine ply, painted it all over both sides with resin mix including through the bolt holes. Then glued strips of rubber from some old convayer belt material onto the chassis rails with evostik contact adhesive, and bolted the wood in place through the outriggers and side rails. I used some large self tappers along the centre chassis rails rather than drilling right through the top and bottom, being concerned about weakening them too much. Will bond to the fibreglass body soon, but not to the chassis. Hope this helps,
Paul.
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