Daniel, I cannot help you with the custom cover, but if all you are looking for is a good, strong cover that will last you for years then go with a pool cover like reelapeelin said. Make sure it's an oval, winter cover, and when you size it remember that pool cover sizes are listed as the size of the pool. What that means is that a cover with a size of 20 x 10 will actually have an additional 4 feet of size, due to the sides of the pool. So plan accordingly. One of the bonus features of a pool cover is that they come with a steel cable and winch to keep it snug against the pool....which means it will also keep it snug along the sides of your boat. You can expect it to look something like this when it's on the boat.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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