Hi David,
Steve Birch knows of a person in the UK who makes a very good Vega spray hood. I saw one on a boat ("Shiva") and it was a nice piece of work.
I had a go at it myself. I like the look of the original spray hood so decided to try and duplicate the original frames, using the old ones as a pattern. I bent the frames up using a home-made wooden jig described in Don Casey's "Canvas Work and Sail Repair".
Some pictures at
Being a little nervous attacking an expensive piece of stainless right away, a practice set of frames from EMT (electrical metal tubing) was made first and test-fit on the boat.
7/8" stainless was used for the final set, instead of the usual 1", as it's easier to work with and, I think, strong enough for most conditions.
New mounting plates were made for either side of the cabin that have 2 pivot points instead of 1. This gives a bit more room for the end fittings when the top gets folded down.
Hope this helps!
Peter
www.sintacha.com