Provided your self build body is safe and legal that should be OK, seat belt mounts would have to be substantial and correctly positioned.
There are loads of builds on here to read through to get a feel of what you need to do. What you are proposing is little short of what was common-place pre WW2. Manufactures produced rolling chassis, sometimes with bulkheads and radiator cowl, the purchaser then had his own body built onto the chassis. Many of the coach builders had their own styles. It still happened with coaches, busses and wagons.
|