I’m working on making my own also have to see how it works. Just taking a piece of lexan and putting 3 pins in it 120deg apart too hold the cover in place for those snowy days I let ya know how it works out.
Sportsman Direct has them too. The guys love em I ordered 20 for the gang last year. They make em for MarCums and Vexilars too I think they were like 9 bucks a piece.