Geof, my header bow is in two parts (c/o Don P) and the whole set up can be folded and stashed in the trunk in a bag that the trimmer can make up. My marine canvas material is glued on to the header bow. The angle at the rear is important - I liked a particular angle and I experimented with the bows in place and a bed sheet to get the angle that I wanted and then stipulated to the trimmer that I wanted clear sections at both sides as well as centre. The centre section at the rear, where it clips to the 'tear drops' on the body, is a piece of shaped stainless that can be slid into the sewn top. There are available fibreglass or metal sections that shape the rear to the body and over the arches of the wheels. I found that I didn't need that with the right kinds of fittings.
Adjusting the bows may be needed and they can be shortened or even extended a little by placing a short plastic tubing 'sleeve' on the joints. Mine did not need that either.
Let me know if you want some interior pics. The one below was before I wet the top and let it 'set' for a couple of days.
