I just realized I never uploaded any information on ordering these boards, so here it is:

You can find the board at https://oshpark.com/shared_projects/GrS5E55G.

You can also find the design files in the github repo.

That's all, folks!

P.S. I'd like to ask that you order a few dollars' worth at least from OSHPark: The shipping may be free to you, but it isn't to them!