Finally got the straps for the seats welded in, went for three per seat, I now have to make up some small ally plates to cover the holes I had to make in the sill panels, it can only get better.
These were a nightmare to do; as I did not want to drill the floor panels, I wanted the bolts securing the seats to the straps to be accessible from the top (not the underside of the car)
I had to position the straps on the bottom of the seats while they were in the car, drill location holes in the seat bases and straps, send the bars to get tapped to M8, got them back, bolt the straps to the base of each seat, (oh, take the roof section off the car so the seats with straps attached could be moved in and out of the car), position the seats on the floor with straps secured, then glue (yes glue) the straps to the floor, load the seats with bricks as seats would not sit flat, leave it for a day (glue to cure), remove the bricks, unbolt the seats and then weld the lot, hoping nothing moves and I did not blow a hole in the ally.
Forgot to say that to remove the paint from the offside sill,(with a drill and wire brush thingie on the end) I had to remove all the gear linkage, grrrrrr. Luckily I plan centre shift cable system, so is was due to come out. can you sense my frustration?
Well anyway it worked, I am able to sit in the car with my hand on the wheel and make brum noises, but with no gear linkage it is a bit monotonic. K