I copied blue prints for number 2 bow, plus used existing one as pattern, there was very little sag if any, I made bows to fit metal corner pieces, and they fit tight, plus when I screwed them in place I used clamps both on verticle and top piece..which indicated the bend correct as the side to side dimension cam out on the money......absolutely beautiful cabby...love the green...I plan on making top from scratch, wife knows how to sew and has commercial machine...so we will use Green Sun Brella, this is normally used on boats, it is water proof and does not fade with sun...great material and with green car should look interesting...Dick