OK so I checked and 0x81ca1a10 is indeed what I thought it was when I had that lightbulb moment before (MTBL). Doesn't seem to contain a reference to the _img that is used for the cutout though, only a value that is labeled "Unk1" in s4pe which is 0x00010341 for one tile doors, 0x00010342 for two and 0x00010343 for three tile. Plus ModelIID and an "UnkIID_1" which repeats the ModelIID in the doors I looked at (possibly the modl for the diagonal version? no, that seems to be "plz use the cutout from this MODL" but that gets me back to square one in a way .. how do I know/define what _img that is?), as well as bounding box stuff that AFAIK only affects the catalogue thumbnails.
I'm curious what you meant by that "just one resource that is also defined inside a combined resource" now ..
