[MrForbes]

We used plywood last year, we're using it again this year. Sheet metal screws hold the parts onto the wood, they are very easy to install/remove (no chasing after the ends of tie wraps or nuts on the bottom side). It is stiffer than polycarbonate (lexan, tuffak) for the same weight. It is non conducting. This year we made a box of it that supports the battery and cRio so we don't need any additional cross bracing, and allows us to remove the complete electronics assembly easily.