I had a short day today; tomorrow, I'm going to Richfield seats to drop off the frames, and collect the GRP shells.
The height of the back was pretty much fixed, but the front wasn't. I used some spare 50mm square plate, and some other bits to make the front mounts:
Actually mounting the back, I had to put a lot of thought into it - and I elected to use something similar to the other seats
However, this is more accessible than the passenger seats.
And with that, I tidied everything up, and cleaned the body to prevent ground steel from creating rust spots (it's quite tight in my garage).