beaker: Thanks for the offer, but I don't think this I (for one) will continue with this quick-swap lense idea. It would be fun, but there are a bunch of problems and I don't think there is much demand for the idea.

Of course, I'll be the first to say "No demand? Who cares, I want to try anyway." But that leads to my second problem; I need a spare fascia to work on. I could try to hack it out of wood (which I am considering), but it would take forever. And even then, the quick-swap lense idea has problems (ie: covering certain areas of the fascia) which will be tough to resolve.

So, no need to create a fascia in 3D. It had no bearing on the project idea and I was only going to do it for kicks in my spare time (which I have none of). But if I do get a wood fascia made and try to hack the quick-swap lense idea, I'll let you all know.