I just wanted to make RestockPlus Oscar-A Fuel Tanks into Cargo Parts like the larger stock Oscar-B tanks, and against my better judgement installed this mod. It aggressively interfered with the Main Menu and kept telling me to restart the game, but otherwise apparently did nothing at all after running the game three times, so I uninstalled it. Only after uninstalling the mod, I found that nearly every single item was now a Cargo Item, including giant fuel tanks, in spite of the mod already being uninstalled. Oscar-A Fuel Tanks even took up more volume than Oscar-B Fuel Tanks twice their size. I tried deleting the partVolume.cfg file and restarting to fix the problem, but to no avail.
So now I've had to uninstall the whole game, delete everything in my Kerbal Space Program folder, reinstall the game, and reinstall all of my mods. In fact installing this mod practically wasted two days of my playing time what with all of the KSP restarts and downloading and installing I've had to do. And so I just thought I'd share my experience here for the benefit of other players. Thanks.