This is a gasketmounted HHKB QEZ Keyboard Case.
For assembly i use M3x10mm inbus screws (https://amzn.eu/d/gTVgd0u), M3x5x6mm heat inserts (https://amzn.eu/d/07RmHPe) and 8x 2mm thick foam strips for the gaskets to mount the plate.
The resin tops are designed for M3 DIN562 square nuts (https://amzn.eu/d/j187y2R)
The rubberfeet have 10x3mm (https://amzn.eu/d/1WdXmLG)
If you need a QEZ PCB, it's open source: https://github.com/kb-elmo/QEZ/tree/master/pcb
and alternative the QEZBerry PCB: https://github.com/IvoPo/qezberry/tree/main/pcb
The author marked this model as their own original creation.