After a few days of contemplation, I think I'll keep going with Option 1, which is to add a few layers of mat and resin in the middle of the area to build up the backside of the panel to be level so the wood fits really well to it. I need to do a bit more work on the wood insert portion. Then I can 'glass it and the alum. angle in as originally planned. My thought being that I could always proceed to either of the other two 'options' if it causes any more problems in the future.
1988 Tristar 190 Sport, 351W w/GT-40's, 1:1 Velvetdrive