My cover has a sewn in strap with metal D rings attached to cinch thw cover down, the strap and D rings will not pull out or tear out like a grommet can. When designing your own the sky is the limit, but remember, the fancier the design with more bells and whistles add to the price! Labor is a big part of the cost...just be sure the material is waterproof in case of puddles forming. Mine is an extremely heavy vinyl looking material with a heavy material like canvass molded inbetween the vinyl layers. At least that is how it appears. Very pliable, never stiff even in the cold. Mine is gray in color and cleans quite easily. Might be costly but this will be the last cover you will ever buy.

 

I make awnings for a living. If you could give me a size that you want a cover made to... highth x width x length, then I could custom make a heavy duty long lasting cover. Hit me up