For a full keyset do I need the Base kit and Beige Mods? For a full cyrillic set do I need the cyrillic and mods or do I also need the base kit in addition?
RBPEDIIIALBase, Mods, Numpad will give you a standard full set; take out the Numpad kit if you don't need it.
You can replace the Base kit with the Cyrillic kit.