My dash was a 2mm ali sheet. I just used a simple push fit u shapped rubber section from Wollies asI recall. Covered it in leather cloth and it looks fine.
Thanks for the reply, I ended up getting one of our carpenters at work to put a 20mm radius on either side of a wooden batten which I will then fix to the lower straight edge of the dash to curve it round nicely, then foam and leather over the top
I just used a suitably radiused piece of wood trim that was then covered in foam and vinyl. I was caught out on the area behind the wheel though so ended up gluing a sliced piece of silicone hose over that and then stretching the foam and vinyl back over the top.