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IMPORTANT!: You can delete the Counter - Strike Source logo/lettering.
Keep in mind that you have to place the clientscheme.res under custom/my_custom_stuff/resource in order to work properly!
C:/Program Files x86/Steam/SteamApps/common/Counter-Strike Source/cstrike/custom
Just put the materials folder into custom. Done. You can always create a subfolder called backgrounds and add it in there, works as well.