I had a late start this morning. The power was off and I didn’t have any light in the shop.
I cut a piece of 1/2” stock to the required dimensions. While I was using the table saw I cut a foot long piece 1 1/2” x 2” scrap 45° along the length for use later. I then drew a lot of layout lines to mark where the curve should start and end.
I stuck the roof to the scrap piece that was prepared earlier using double sided tape. I want the end of the piece to sit on the top of my spindle sander at 45° and started sanding to the profile needed paying attention to layout lines as close as possible.
Once both ends were finished to my satisfaction I started the top curve on the belt sander; again watching my layout lines.
When the top was profiled I sanded it smooth starting with a palm sander then by hand. I then glued the top on to the rest of the cabin.
The little bits of glue showing will be sanded off quite easily. I then photocopied the side trim pieces and glued them to some 1/8” maple stock.
-- If we learn from our mistakes, I'm getting a fantastic education.