Note that I use duct tape to hold the canopy width while cutting the side panels. On the rear cut, I made a penetration through the canopy at the cut line and fed duct tape though to hold it in place during the final separation, otherwise the thing would "get away" from you on the table when not held in place by the wood jig blocks. Woo hoo... it's starting to look like a real canopy!!
Duct tape cut through the canopy to hold it in shape when cutting the rear side sections off.