I couldn't wait until I had help. Where there's a will, there's a way. And, I figured out that way. One side was clamped to our workmate and the other side clamped to a saw table. A line was wrapped around both sides at the bow to hold them in place. Another line was wrapped around both sides at the stern, and then #3 bulkhead was glued and nailed.
To help hold the bulkhead in place, I hot glued a couple of small blocks of wood to more easily position the bulkhead. After the nails are in, the block can be knocked off with a tap from the hammer. This can only be done if the plywood has been coated with epoxy. I tested bare plywood using hot glue. When I pulled the two pieces apart, some of the plywood was ripped off. Good to know.
Bending the sides to fit was not that hard, until I came to the stem. I used every clamp and tie-down we had, and still needed more. So, we made a trip to Harbor Freight, and added two 24" bar clamps to our collection. You can never have too many clamps.