I have seen someone put these in a g80-something. They aren't too good for pcb mounting though so they ended up making a small plate to help keep the switches aligned.
I finished a 60% handwire board with clicky SMKs recently and had a bit of trouble convincing them to clip in properly to a 1.5mm plate. I think 1.2mm would work better.
BlindAssasin111 on Geekhack can make you a SMK PCB. I'm going to use his service for my AppleReDesign Keyboard (currently on hold right now due to other projects)