Hi Grizz,
Well one of two ways - Im either going to put one bungy along each length of the canvas (I will add a few eyelets in to help secure/tension it) and the use simple riveted hooks on the body work or use a bungy ball on each eyelet - and again with the hooks
Once I get it I will have a look and see what is A) Most practical B) What is in keeping with the patina look C) What isnt going to be a huge job that never gets finished before the winter.
PS - Thanks for the photobucket hint. Bloody dropbox