Well, my prototype is being fabbed by OSHPark, along with a stencil from OSHStencils!

I also designed a couple of adapter boards. One for an IN-12, because I test everything with these tubes. This is a vertically mounted board. One for an IN-18, because I wanted to make a horizontal adapter and I also need an adapter for those tubes.

So, fingers crossed that I didn't make any mistakes in the design and layout, and that I can actually build it without messing it up!

I uploaded the OSHPark render and the schematics for the design.