Eric, it is a left over from my old Cubby House business. I don't have plans to copy. It's all in my head
If I had the materials, I'd make it a tad larger. Damn hard to do star alignments crawling around in there

but I used what I had.
If I can work out a way to make them so they are cheap for people to build (a bit larger of course) I will draw up some plans.