Money is the main factor on getting them made. As most of us are common joes that go to work every day to pay the bills & put food on the table we cant come up with that kind of money to make the molds. Plus not everyone will want to pay $500 or more for a top. If you pay to make the mold you have to pay for the material plus the factory to do the molds for you. That could cost another $2500 at least. So lets just say $7000 to $10,000 to get this done. Most people that I know in this hobby can not afford this. Plus not everyone that needs a top will pay that kind of money for one.