Nice progress pics there
I might be wrong ( sorry if I am ) but from the photo your upper harness mounting points appear quite low in relation to your shoulders, maybe its just the angle of the photo but was just something that caught my eye .
The seat belt anchorage is quite in depth from the IVA manual, They use a small block placed on the seat base then work from a fixed measurement from that, might be worth double checking sections 19 & 31 from the IVA manual.
Again...just my opinion but unless you have very short arms
then the steering wheel looks close to your body, have you tried that position with the scuttle fitted yet ?
keep the progress pics coming, its looking great
cheers
andy