Gentlemen, I think I'm onto something

Hirst Arts in the US sell molds, so you can cast your own pieces to build dungeons like what Dwarven Forge sell.

The big difference of course is that once you have the molds, you can cast as much as you like. Start when the wife leaves for work, the glue should be dry before she gets home, and hide it in your undie draw. Sure you'll then be wearing 4 pairs of undies to make room but we'll cover that in another blog post.