Charles. Missed the link title the first time. Left a link this time.
Tom and I have had some conversations in the past about ROPS and I put this up on my site. The address is http://www.springfieldbiz.com/tractor/rops.html.
If you can get this built I would think putting a canopy on it would be faily simple. Am trying to get some better pictures.
Hope this is useful.