But those screen shots of the DooMer skins just don't seem right for some reason or another.
You're right to think that. They're incorrect. I went through DOOM and Daemia's campaigns last night, and I took photos of both the stat screen and the loading screen for each upgrade. Unfortunately, the pictures came out horribly dark, and the sporkers at Sam's Club didn't develop all of my photos. I'll see what I can salvage out of them if anything and post it.
If anyone wants to try something like this for themselves, there's a level skip cheat for Q3R.
While holding down L1, L2, R1, R2, and Select, press... X, Circle, Square, Triangle, X, Circle, Square, Triangle, and then release. If it weren't for the loading times, this would make everything so much faster, but it took me probably about an hour or so to get through one campaign. (The loading times are seriously that bad.)