uhm........Canvas Enclosure and Air Tight? I do not think such a thing exists.
If you want air tight, you will have to go complete full hard cab enclosure.
I have your same roof. Hold your hand up to the roof when driving, and feel all that air.
Our plastic roofs scoop the air in.
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This guy does a good canvas full install, worth the look.
I think he was using Enclosure from SideXSideEnclosures.com
Soft Cab Enclosures and Upper Doors for Utv Sxs Yamaha Polaris Kawasaki Artic Cat Textron Honda Coleman Odes Hisun Massimo Bennche Yamaha Tractor Supply Utvs. We make enclosures as easy as 1-2-3. Let us help protect you from the elements, and use your utv year yound.
utvenclosure.com
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This guy has a good way of stopping some of that air that our roof brings in.
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and then my cheap winter enclosure, with links to the guys I got the ideas from.
My cheap cab enclosure. It actually turned out better then I thought it would. ....... and I installed side mirrors, windshield, front bumper lights, and side flashers. My first build try. . First, hats off to these guys for the inspiration. - and - Homemade rear panel and - P1000 - DIY Vinyl...
hondasxs.com
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Have a good day