Jon
I will take a photo when next down at the boat. You must sail much faster than I do. I don't bother with the fairing plate, and the outboard never kicks up. Can you tighten the pivot bolt?
From memory, the plate is just a fibreglass piece, maybe 5mm-10mm thick, 20-30mm overlapping the hole, and depressed into the hole. I guess if you taped some ply flat beneath the hole, laid clingfilm in the base of the well, and did a gel coat/grp layup inside, you would wind up pretty much with what I have. The forward end would need trimming around the outboard leg. There is a safety line attached to it somehow, to prevent its loss if dropped down the hole, but I can't remember how it is attached.
There are two turnbuckles screwed directly into the base of the well to hold it in place. I don't particularly like this idea of screw holes in the grp below the waterline. They are quite hard to reach when the outboard is in. If I were starting from scratch I think I would seek another way of fixing it.
Whilst I do not use mine, (it needs re-profiling since my change of outboard), I do not want to part with it, but you would be welcome to borrow it as a pattern.
I find it hard to believe that the absence of a fairing plate makes an appreciable difference to performance and, since I don't leave my outboard immersed when I leave the boat, I have dropped it from the routine. I would have thought though, that you would get a fair amount of noise transmitted to the hull through it, and would lose paint off the o/b leg, if it were relied upon as a backstop.
Good Luck
Jim