I had been planning on making a box to put the computer into for a while now, it was just low on the priority list. The time has come. Even with the vac system for collecting dust, there is still a bit of it blowing around. I took the case off the computer and blew the dust out with some compressed air. It is surprising how much dust had accumulated inside the computer.
The design of the dust protection box is really simple and follows the same principal as what I used on the electronics enclosure. Basically a box within that pressurizes the box with clean air. The plexiglass in the front slides up and down, allowing access to the computer (the lower hole lines up with the power button on the computer). The top holes allow a place for the air pressure to go. Also the hole in the back (for the computer cables) will have foam around the cables.
The last picture shows the back after routing out the holes and rabbets. This is the kind of work I had envisioned using the router for. Nothing real exciting, but a real time saver. The rabbet for the large hole fits the filter perfectly. Doing things the old way (pre-cnc router) would have been a compromise with fitting the filter into the rabbet, since finding a guide bearing for the rabbet bit, to match the radius of the filter would not have been possible. And best of all, I didn't even need to use the CAD to draw this up. I was able to do the whole thing in CAMBAM and it only took a few minutes.
I also made the cleats that hold the filter on using the router. And cut the small square hole for the switch.