The "Type-S" models will work as well, but note that if you retain the silencing rings you will experience slightly reduced tactility, and the keys will sit roughly 0.5mm lower than on a stock HHKB.
There are two housing variants to accommodate two different breakout PCBs, which each have their own size and location of USB port.
This variant accommodates a breakout PCB with a USB Mini connector.
This variant accommodates a breakout PCB with a USB-C connector.
https://youtu.be/A_TYlwbZ8o4?si=INwN7OXbCeRpUGJN&t=151
Front height is 16mm.