Glassed. I did leave out a step in my previous description. I made up a couple of flat pieces of glass to use around the rocker covers. When it came time to glass the plenum, I joined them to the rocker glass pieces. I spread some light grease over most of the foam, prior to glassing, as a mold release agent. Notice also that the plenum was laid up in two pieces. This affords me a split line. I used three BID and Aeropoxy for most of the plenum.

If I were to do it over, the only change I would make would be to fabricate alumimium plates to go around the rocker covers. I have had some minor crushing of the glass under some of the rocker cover screws and the alumimium would fix that problem.