The case files and BOM are in the OP
Yup! I ended up finding the files. For anyone else reading this the PCB way quote for the UTR-8100 transparent resin was about $69 for back and $79 for front, Net about $150. Not too bad.
Never, the kit isn't coming back. You can make one from parts tho. The files and BOM are here, and CrazyGadget updated a few of the BOM links here
The original G-Boy manual is still mostly accurate to Dustin's remixed parts. All you really have to correct for is the new 4layertech boards, which have their pinout diagrams on the listings for each product, and possibly the screen wiring if you use the 480p screen instead of the 240p screen that was used in the kits.
4layertech sell new versions of the original PMS, PD, U-AMP, and GC+ boards that were used in the G-Boy kits, and the 480p screen has a different driver board to the 240p one that was in the kits. The pinouts are sightly different, so you'll need to use the instructions as a basic guide for how to wire it up, and match up the white silkscreen text on the boards to the old wiring diagrams. The principle of everything remains the same
You'll know because the designators for the pads have the same names, and the 4layertech website pages for the boards have detailed updated pinouts showing how to wire them correctly.
There are no complete kits of any kind available. The closest thing would be the Ashida, for which you can buy all of the PCBs and the screen directly from 4layertech, but you must source your case and other misc parts from the Bill Of Materials yourself
