Pt. 3 Making A Custom Sport Classic Seat

Part 1.
Part 2.

Part 3: On to the foam. I use 2" rebonded foam adhered with 3M Super 90 spray. I carve out the overall shape with an electric carving knife and do the fine tuning with a flap disc on a grinder.

It was looking a little too tail-heavy so I kept removing material from the top. Here's the finished foam shape. I drew in stitching reference lines for the upholsterer. That's where the seams will be. The idea behind the design was to mimic the trapezoidal protrusions in the tank.