Seat update as requested!
Since the seat pan was molded I needed to devise a way to mount it. I had a few possible solutions rollin around in my head when I was designing it so here is the way I finally went. I found these tube clips in the trash at work that are used to mount shelving to 1" round pipe and went back to the frame a cut off the original front seat mounts. Naturally that meant a little touch up paint on the frame.
When I had mocked it up I had forgotten the rubber cushion at the rear of the fuel tank so once it was installed the front of the seat was too low.
I attached the clips to thin pieces of wood then glassed those to the bottom of the seat pan. This gave me a way to mount the clips
and raise the front of the seat to the proper height...
I will be using some small flathead (countersunk) screws to hold them more secure than relying on the glue....
Next came how to mount the rear. Since I brought the rear fender around forward to shorten it up and that left the original fender mounting holes wide open to use for the seat. I picked up some blind nuts and bolts in a sturdy size of 5/16" (or about 8mm)
I set the seat in place and marked the holes to drill on the rear...
Then scuffed the location with 80g sanding disc, mixxed up some epoxy and pressed the blind nuts in place. I found it was easier to use a large socket as a "Reciever" on the inside and channel locks pressing on a bolt installed in the nuts to seat them through the fiberglass.
And here is the outcome, I think it lined up pretty darn good and now I can move onto covering the entire thing with thin foam and sew up my vinyl cover ... or take it to the ulpholstry guy to sew my leather into a cover.