Plates

Below is a list of HHKB plate files that I have used for different keyboard build projects.

Notes

Each plate is for an HHKB-style layout, including: split right shift, split backspace, and blocked bottom corners (even for tray mount designs, so they'll be blocked solely by the plate themselves, not by any top case).
Unless otherwise specified, plates will: have a 1u-1.5u-7u-1.5u-1u bottom row; use MX PCB-mount stabilizer cutouts; and exclude center- and spacebar-position screwholes (specifically for tray-mount plates).
For MX, you'll want to get these cut in materials that are around 1.5mm thick. For Alps, it's recommended to cut these in materials between 1.0mm to 1.2mm thick (but I have personally gone down as low as 0.8mm and retaining backing layers).
I use Ponoko to cut plates. They (as with any other service) won't necessarily provide every material in every thickness. These files are all in SVG format, which upload rather quickly to their application (compared to DXF).
Generally, I'll use softer materials for higher kerf values (e.g. 0.2mm), and harder materials for lower values (e.g. 0.15mm), but your mileage may vary. I have only included one kerf variation for each plate.

Plates

Plate	Kerf	Notes
Sirius Alps	0.2mm	For Project Keyboard's Sirius. I have had this cut in POM and in leather.
J-02 Alps	0.15mm	For proto[Typist]'s J-02.
PH60 Alps	0.15mm	For DeskDaily's PH60. Not public - send me a message for more information.
Tray Alps [6.25u]	0.15mm	For tray mount 60% keyboards with a "standard" 6.25u bottom row (1.25u-1.25u-6.25u-1.25u-1.25u; would recommend cutting or engraving a design on the bottom-right corner blocker, which is twice as large as the left).
Tray Alps [6.5u AEK II]	0.15mm	For tray-mount 60% keyboards with AEK II bottom row (1.25u-1.5u-6.5u-1.5u-1.25u) and M0116 modifiers (for split backspace and split right shift). Alps plate-mount stabilizers (to match the keycaps), tray spacebar screwhole.
Tray Alps [7u]	0.2mm	For tray mount 60% keyboards. "Cool S" cutout designs near spacebar. Adjusted kerf for looser switches in softer plates. Updated with larger stabilizer cutouts.
Tray MX [7u]	0.2mm	For tray mount 60% keyboards. "Cool S" cutout designs near spacebar. Updated with larger stabilizer cutouts.
BMEK MX	0.2mm	For jauz's BMEK (HHKB Alice). Kerf adjustments only.
Honeyboard HB60 MX [3-1-3]	0.2mm	For MTBKeys's Honeyboard HB60. Full plate with 3-1-3 spacebar compatibility.
Compaq MX11800 [Arrows]	0.15mm	For vintage Compaq MX11800 keyboards. (2)
Compaq MX11800 [Function]	0.15mm	For vintage Compaq MX11800 keyboards. (3)
Compaq MX11800 [Numpad]	0.15mm	For vintage Compaq MX11800 keyboards. (4)
Sangeo60 [3-1-3 Half]	0.15mm	For Monstargear's Sangeo60. Half plate with 3-1-3 spacebar compatiblity.
Sangeo60 [Alphas]	0.2mm	For Monstargear's Sangeo60. Plate for alpha area only with matching cutout fillets to the above half-plate so that they can be used together.
Y.6 [3-1-3 Half]	0.2mm	For Y.6. Half plate with 3-1-3 spacebar compatiblity.
Y.6 [Alphas]	0.15mm	For Y.6. Plate for alpha area only with matching cutout fillets to the above half-plate so that they can be used together.