Here is the start of the rear mounts for the seat, which bolt to the inside of the upper rear shock mounts. They are steel flat stock, and are notched around part of the frame. Some of the frame here has been ground down before for my old seat. The seat mounts also double as turn indicator mounts.
Here are the rear mounts almost done. They are tied together with some small square tubing.
Welded and cleaned up. I welded in a bulkhead for the rear of what will be the under seat storage area, and closed it in on the top/rear. The front seat mount is angle steel that will bolt to the stock seat mount on the frame. I decided to incorporate the rear gas tank mount into the seat, and I'll have more about that later on.
Here is what will be the front of the bum stop. I took a piece of 16 gauge sheet, and first bent the bottom so it will flow into the seat base. I then put it in place and traced the outline of the bum stop onto it, then cut about 1/4" outside that line. I then made small cuts just past the outline, making little tabs. The tabs are then bent back, and can be adjusted to get a perfect fit with the cowl.
Here is the front of the bum stop in place, almost ready for welding. The bottom sides of this piece still need fit and trimmed. I'm very happy with it so far, and it will only require a very small amount of body filler.