If it ain't broke don't fix it
I attempted to paint my motherboard tray. Everything was going smoothly until I dropped something into the fresh paint.
I wasn't able to fix it with the time allotted so the windowless side panel will be used until I try again.
The case was cleaned out completely. Every few weeks I hit the filters and inside with a Datavac so there were only a few place where dust accumulated. The removable motherboard tray made cleaning and attempted painting easy.