If its not too late... well its never too late to look at I guess. Not sure if it counts because I made them a while ago, but I made a few mini figure window display cases on my Nomad. Also, sorry I don't have any in-progress photos, only fully assembled.
A) I used 1/2" and 1/4" poplar "hobby" pieces for all of these (relatively cheap, and these were getting painted anyway) and clear 1/8" and frosted 1/8" acrylic, some magnets (1/8" x 1/2" square and 1/4" x 1/8" round), and some felt to cover the base.
B) 1/8" square, 1/32" square bits
C) Illustrator, Carbide Create
E) Double sided tape!
F) Finished with a bit of sanding, pocket screws to connect the base to the walls, and spray paint, the front and back acrylic pieces just slide into 1/8" slots, and the standard mini figure bases sit snug. The lid stays on well with the magnets and pressed into the 1/8" slots.
G) Wood from Lowes, Acrylic from Tap
Don't have the files handy, but can dig them up if anyone wants them! (although they were an earlier version of Carbide Create, so I don't think they'll open up in the new version).