DanielT wrote:This is a real cool build.
I'm also planning to build a custom 60% keyboard, also with acrylic plate. Read all sorts of opinions but never saw a finalized work. So I have a lot of questions

1. How thick is the switch plate ?
2. How is the stability of the plate, does it flex ? I saw the plate is only supported on the exterior, no central fixing points (I have the same design).
3. I see that you have plenty of space for wiring and teensy, how thick are the spacer plates ?
Because I have read that the plate might crack my first attempt was with a 5mm plate, it looked nice but the switches didn't clip in the slots and were very loose

and did not want to glue them into place.
Now I plan to cut a plate 1.5mm thick and also maybe test with a 1mm aluminum one.
The thickness of the acrylic I used for the plate was "1/16 inch" but for acrylic I think it varies. Mine was closer to 2mm, so I had to dremel down the top and bottom of the square to make the tabs that click the switches into place connect.
There is no flex on this plate. It is shocking how stable it is. I think this is because it is so well fastened to the middle layers and bottom of the plate.
My design
does have middle supports (three actually, in the middle) and I used nuts wrapped in electrical tape to separate the top and bottom. You can see it pretty well in the pictures. [EDIT] Here is a link:
http://i.imgur.com/4rg4yfu.jpgAnd also, there was actually very little room for the components. I used 1/8 inch acrylic for the middle slices, so I actually only had about 9mm to work in. However, I insulated the bottom of the teensy and was very careful about making the connections to the switches underneath them.
There ended up being so little space for the Teensy that I had to dremel out the bottom plate in multiple places to make room for the solder joints and the female mini USB connector head.
I describe that whole part in the album.
Let me know if you have any trouble, I can probably find my measurements somewhere if you need them.