[77newell]

I talked to Recaro a few years ago about obtaining a couple of their seat belt integrated seats. They refused to sell me any unless a strength pull test was conducted on the mounting structure to verify it would support the forces needed in an accident.

If you wish to accept the liability of doing your own engineering you can obtain used seats from truck, rv, and bus part recyclers. Personally, the only way I could be comfortable doing that would be to replicate what was done on a similar Newell, structure wise. I really would rather not do a face plant on the windshield accompanied by the seat, that would improve neither my looks nor my mood.