Maniac Mitch is correct -- they are very open to guest course designers. I have designed several for them. As with any club, you have to be there for setup in order to ensure that the course ends up as you envisioned. I know first hand that it is hard to create a course (even with a map) in the way that the creator intended unless they are present.
BTW, if you are interested in creating a course (or even just playing around with an idea), then PM me and I can send you my blank courses. They are in MS PowerPoint format.