So, after a quick read of this, I do have to say (and this is based on personal experience), custom maps (that aren't map edits of pre-existing, like fixing or replacing things in Moon, Kino, et cetera) don't work too well in Plutonium. I will recommend that you use standard BO_Mods stuff instead if you want to play custom maps, especially since (if you haven't noticed), there is no Custom Maps section in Plutonium BO1.