Because the seat attachments were welded to the frame only on their inside edges [so that the seat legs could slide all the way down to the frame on the outside of the attachments], I added trusses (in blue) for strength.
A Maker's Site
Because the seat attachments were welded to the frame only on their inside edges [so that the seat legs could slide all the way down to the frame on the outside of the attachments], I added trusses (in blue) for strength.