Thanks for the idea! They seem to have no parents and I can't seem to find out any more information from the lists of GECK functions :( So adding a reference override in a WRLD group in a seperate esp doesn't seem to do anything, and changing the reference in game doesn't change the static prop unlike objects that aren't under a combined key. I might give up on it until the editor comes out or someone smarter figures it out, as I can't seem to hack it to change anything atm :/