PC dust issues

I am in the finishing phases of the overhall of my 3 axis wood
router. I am now wondering how to keep the dust out of my PC and
monitor.

I was thinking of using an enclosed plywood box with a plexiglass
front. It would have on each side furnace forced air filters with
muffin fans to move the air. I believe this would do the trick of
keeping the electronics clean, cool and within budget.

The key board would be outside and have a dust jacket over it. I
will have to blow it out every once in a while.

Any other ideas?

Dex