Due to the lack of reinforcing ribs, that cover will leak like crazy unless it's glued down with some sort of high tech moose juice. Then every time the valves need adjusting, you'll have to go through the same leak-stopping procedure all over again.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!