Yes, I built mine up from scratch.  I cut the panel from 3/4" board, then a layer of polythene, followed by 5 layers of fiberglass.  I curved the glass around the edge to add strength.  Then it was a question of removing it from the board, filling , sanding and painting.  I made the panel flat, without the bump for the radio stack.  If you are using a header tank, check for radio clearance from the tank before you set the panel's fore and aft position.

 

Quite a lot of work, but the result is strong.  Just be careful that there will enough clearance from the canopy, allowing for the dust cover.  You can see the result here.

 

Jerry Fisher