I've the panels painted, just need to clear coat them. The only thing I didn't paint was the back of the case where the I/O stuff is, and the PSU mount, since I forgot I had it until I was looking at a picture.
Recommendations on painting the back panel of the case, or just leaving it stock finish?
I paint them, just to make them uniform. You can paint them, and then take some sandpaper to the inside of the I/O mounting square to get to the bare metal.
On the board panel I didn't mention:
I screwed up the first time because it was my first Extended ATX/BTX case. I masked out all the way to the last standoff's, which is one set too many. It didn't even cross my mind that this was too far out until I stuck the motherboard in there.
I learned though, and now count out and paint out to 3 stand-off's only. If there's more, they're getting painted (I ain't sticking to eATX boards in a build).
Note the PSU mounting plates too. They're in opposite places for the picture, but they're bare on back. The fan blank should have been painted both sides, but you only need one side of the PSU plate to be painted. Got lucky again as the fan blank wasn't used more than a month...pretty useless.
And now, I'm painting it all just to keep the masking down. I take a hole punch (like you use in offices or whatever), and punch out tape circles to use as masking for the standoff holes. I tried "paper buttholes" (sticker things you put on punched paper holes when they rip apart) on the last job errantly. Stuck them down then roughly put tape down to cover the middle hole, but it's too big to me and had to redo it. I could just see the arch of unpainted surface poking out from behind the board all around the corner. But for sure, I'd mask off the standoffs. Remember that you're not going to see it since a board will be over it, so it won't show. I'm OCD though, and want to know there's paint there.
If someone is doing this haven't painted it yet, it may be worth thinking about dremeling out a square access on the motherboard panel. Then you don't have to remove the motherboard to change out coolers in the future. Exaggerate the hole a bit, as you never know what board is going to be in these cases, thus the size of the cooler backplate. I got lucky by making it a bit bigger than needed for the 775 back when, and now makes cooler switching a snap with the i7 and now the i5 in it. That first case is now going on 6 years, and a lot of stuff has been in and out of it in that time.