After trimming the canopy bubble I could then set about match drilling the skirt pieces to the canopy frame. I just followed the instructions, no dramas.
When drilling the holes through the perspex bubble I did set up the patio heater again, just to keep it all warm. Got a bit hot on the top of the old noggin though!
Match drilling the right side skirt to the canopy frame
Drilling the inside skirt piece to the frame
The patio heater set up again when drilling the canopy