I actually did the same basic thing for my sails on my MacGregor many years ago. Got the same canvas-like materials at JoAnn's as well. instead of zippers (since these would be stored out doors), I used large clips, such as those used on back-backs and computer bags. Only had it for a few years after, but they looked great. My ma even embriodered a nice sailing logo with "MacGregor" on it. Make sure it's doubled up, and/or re-inforced anywhere it will rub, or contact the table. Extra strength and padding for the handles would be smart too. Think about how it will be stored too. Are you going to have it hang from something or strap it down? If so, maybe some extra loops for a hook and/or tying down would be a good idea.
_________________
Walt B
"Debt-Charged"Black '07 H210SS6.2L Bravo One turning a 21P HIFive
Wakeboard Tower with Perfect Pass Stargazer version
Missouri River; Kansas City, Mo.