The final build session involved clecos and riveting. The seat came out well. I had purchased the metal back seat because the seat that came with the project when I bought it from the last individual had the metal seat with the fiberglass top. I felt that the metal seat was better so I sprung for the parts. This was by far the best work sessions I have had during this project. It was awesome to work with my son and grandson....making memories while building a dream!