Thanks man. Usually the only restrictions are:
Factory availability; there's only a limited number of designs that the factory can produce. We've also seen that they struggle with custom orders a wee bit so adapting their existing manufacturing to newer kits can take time to get right.
Demand for kits; Adam stocks and imports a pretty wide range, but normally just what sells. You could always have him inquire if factory can produce it. Asking the question costs nothing, it's just that the answer may end up being no.

I'm not sure if there are any copyright restrictions associated with the JS shape, that may also limit what can be done.