OK, the ordeal of making the cowl is finished. It's really not that bad, I'm glad spackle sands so easy. Here's the photos. Now I have to figure out how to attach the hatch. I'm thinking a rear ply tongue and front 4x40 bolt. I know earlier I said seal w/ RTV, but I'm re-thinking it.

It's amazing how far off the engine mount had to be to account for the offset to get the front of the spinner to be on centerline.