I'd suggest perusing the internet, particularly yachtworld, for a boat for sale with the bimini up. Looking at other center cockpits might also help. I looked quick but didn't find any photos even though some listed a bimini as equipment. That's what did when I was trying to get a handle on what would work on the 9.2A. Like you, I inherited a bimini frame, but with no canvas on it. Save the frame, it might be worth something as a trade in if you go to a local shop, especially if it is stainless. At minimum save the fittings if they are removable and in decent shape. They might be useful for something.
I had thought about taking a hack at building a two bow bimini to cover the helm...I can't beleive they actually want to charge more for a small bimini than a large, but that is what this site indicates. I suppose it is for the extra rail mount fittings and spreaders involved.