I had a thin piece of carbon I cut from the tray of another ski. Made it thicker by wetting out a few layers of carbon twill on either side. Put it all between two layers of wax paper, then between two hard flat surfaces. Then I put weights on top of it and went to bed. I used aluminum blocks drilled and tapped on the sides to attach my ebox but they got loose and stripped a few months later. So now I have to use a backing nut and it's a pain. epoxy stainless t-nuts to the back or better yet slide bolts through from the back and you have studs to slide the box on like oem. Add a few nuts on each side for ebox spacers. I attached it to the hull using thickened epoxy. The bottom rests on a small ledge on top of the bulkhead. The plate contacts the hull down the center and across the bottom so I applied the epoxy in an upsidedown "T" shape on the back and smooshed it in. My dash wasn't thick enough to install a hood latch so this ebox plate killed two birds with one stone. Hood latch held it in place while it cured.
