Hellooo,
I am very sorry for the unbelievably late reply, I have had a few problems being able
to get in here and things slipped a lil bit.
My roof was made here in England, Whiff, the guy who made it has since retired
and no longer makes them.
I am quite surprised that roofs and the way they attach to the body hasn't moved on very much over the years
with the lift a dot system being still widely used.
There are three clamping pieces fitted inside and along the rear sides and back of the tub, the roof slides under each
and the entire set are then pulled down and the rear hood edge is clamped in position.
Here are some photos, once again, I am sorry for the late reply
Regards
Peter