Took me a few iterations and false starts with the printer: got some painter's tape and forgot to set Z-Offset (I'm back to glue on glass), but I finally figured out the dovetails.

I'll export this to STL, fix it in AZURE, then publish it in Thingiverse (but it'll also be here). Print twice and you have all 4 corners and top and bottom rails for 1 zero. Thereafter, you should only have to print once per zero. I think the real estate is like 14-15mm per zero.