I have a golf cart top that I mounted to my ROPS. I got a soft cab from golfsmith and secured it with velcroe that my wife sewed to the fabric
The other half was the adhesive half that I mounted conviently on my tractor body.I took up the slack or extra material with plastic clamps from Lowes. The cab cost me around $50 and the bundle of clamps was about $15 or so. I used it last year and couldn't believe how nice it was and with the sun comming thru the window area it was toasty with few drafts. It has zippered doors to get in and out.