canopy hard roof/canvas side design

I am in the process of designing a canopy for a Navara single cab.

My initial idea is to build a square frame from RHS that covers the tray area and cab. The canvas sides would be on rope tracks for fitting/removal.

I am thinking that the canvas would also have to be across the front of the tray to avoid hassles with the design if I had a hard front i.e. sealing the canvas to front area to stop dust.

My only real problems are how to mount the tracks and canvas

The canvas will have to be at least 2 piece with a (zip?) joiner. Can dust/rain get in at this point? What design will combat this?

The same applies at the corners where there will?? be a gap between the tracks to allow the canvas to go around the corner.

At the front the track will be forward of the front of the tray (only by 10mm or so, not sure this is a big problem)

Any design ideas or photos would be much appreciated. Photos can be sent to me at keyperth@yahoo.com.au

Would love to have a look at other peoples rigs in Perth metro if possible

Steve M