There you go with those huge cast part requests, buddy. If I had a canopy to make a mold or molds of, I would cut the sides off, and make 3 molds of it, to be assembled later. Material wise, it couldnt be done for less than $30 and I'm sure that you could find a canopy loose on ebay for less than that.
I can't even remember what this part is shaped like, it's been so long since I've had one.