Re: how do you protect your cnc PC
I wouldn't worry about it too much. I just have mine setting on top of the control cabinet, easy to get to that way. I blow it out about once a year. Dust does not seem to bother PCs too much. I have seen them with an inch of dust and running just fine. Metal chips are another matter, then you have to keep the PC out of the line of fire. If you really want to enclose your PC then your proposal will work just fine.
Here is a pic of mine prior to its spring cleaning, was running just fine.
Jim Dawson
Sandy, Oregon, USA