Having opened up the old computer and seeing the dust, it motivated me to pull my main workstation out of it's spot, and haul it to the garage for a blow job. It was about as bad as expected. I have been procrastinating doing it.
It has a heavy duty steel chassis. with the 5 spinning RAID drives, the two M.2 drives hidden on the motherboard, 256 Gig of RAM. and a total of 10 fans counting the ones on the two video cards it is a heavy brute. I have room for 5 more hard drives.
My back is happy it is back in place. The dust buildup was not horrible, but more than I wanted to see. The case has two knobs I can turn to crank up the two 8 inch fans for intensive CPU use. I thought about water cooling it, but come on, I am have owned at least one cooled car since 1970 when I started driving.