The GTX 1060 is spoken for and I'll probably want to keep the 6400T for motherboard testing unless I can find a good price on a 6600T.
I have two cases but only one one set of parts, of which I could bundle the STX board, modified CPU heatsink, M.2 to PCIe adapter, Adex Elec extender, 160W AC-DC, and test wire harness.
So the video card, possibly CPU, DC-ATX solution for the GPU, and storage would need to be sourced. I would recommend using a GTX 1050 Ti because the GTX 1060's power draw caused many headaches and it will be right on the edge of the 160W AC-DC unit's OCP trip point without lowering the power limit.
Then it's a matter of getting it all to fit, which will almost certainly require shortening all the cables so they take up less space. And I never really figured out where to put the SSD.
A regular 2.5" drive won't really fit anywhere, so I was planning to take the Samsung 750 EVO 250GB and remove it from the casing since the PCB itself is tiny. It's actually smaller than any of the mSATA to SATA adapters I've seen.