On my workbench today is the Heavy-9. I 3d printed some adapters to mount the plate and PCB. The was needed because using an acrylic plate that is too flexible to mount with the traditional methods. There is a small scrap from the backing of a mouse pad between the 3d printed part to give a nice bouncy feel. Also had to stack up a few 15mm x 30mm under the spacebar to prevent too much flex under the spacebar.
I still need to cut 2 of the screws down a mm or so to dial in the feel.
Edit: All done! Its nice keys feel like I wanted them to.
USB-C cable fits through the opening without molding the housing (I am using a zap cable, regular off the shelf cables didn’t fit.
I ran out of screws that were the right size to secure the USB breakout board to the standoff. I had to result to hot glue which I know is lame. But it works and is surprisingly strong. I will swap that out with screws next time I am in there along with a universal usb-c daughterboard