The small hole in the picture below is the seatbelt mount - the big hole and the rust shouldn't really be there - it will all be stripped out and replaced with fresh steel. Seatbelt mounts will be reinforced.
more rot..................
The ACME bus has been on the ramp all day while Jim has been nudging the rear end towards the ground and repositioning the shock absorbers. After much cutting and grinding (and taking the wheels on and off about 30 times) we have managed to get the bus down another 2 inches on the rear - now the rear end scrapes the ground as much as the front :-)