What pcb will you be using?
I'm gonna handwire it. It's juts cheaper and for me better than having to make a PCB.
With 3mm plates (that's what they look like) and no undercuts or PCB, the switches won't "lock" into place and you'll have to use hotglue or some other means of holding the switches in place. Even then, the horse of pulling keycaps could pull the switches out the plate. I'd look into both undercutting the relevant area for the switches (see pic below for an example) and using a PCB, or using a 5mm plate and PCB to get better switch / plate strength / stability. With a 5mm plate, the plate is held tightly between the switches and PCB and the whole assembly is nice and strong and you don't need undercuts, but it means you need to mount all the electronic parts on the bottom of the PCB.
Show Image
(http://www.gonskeyboardworks.com/164-thickbox_default/universal-frameplate-for-60.jpg)
What controller are you planning on using?
Gonna use a teensy 2.0, thanks for the advice, I'll look into for the next build!