Aera partly fill with pink foam board and a piece of aluminum to block off the rest of the aera
This much 2 part urathane foam
After mixing and pouring into cavity
After foam expands and form stripped
After all aeras filled
Tools used to ruff foam in
Pic after epoxy and glass cloth also aluminum panel sitting in place
Shot of rocker I made in place
Looking inside buck at rocker ......nice fit
More later