I Tried To Make A Door
In the GMND for the diagonal door, change the tsMaterialsMeshName to doorValue. Fix integrity (nothing will change if you don't), save. Check the Scenegrapher under Tools<Object Tools - there should be lots of stuff there. If you're curious, check the Scenegrapher BEFORE you make any changes - you'll see there's hardly anything there and all the SHPEs are "false". What you did was slave the diagonal to your straight version. But your straight version is slaved to the in-game door. Silly lambkins.
I did try slaving the diagonal GMND to the "doorValue" at first but it didn't work, apparently because I didn't know to do Fix Integrity. So then I tried doing like the tutorial said and slaving to my straight version. And that of course didn't work either so I flailed and gave up and asked for help.
As for the wallmasks, I don't know. I just cloned the Maxis door and kept the mesh and masks exactly as they were, aside from deleting the gender sign.
OMG this is great progress though. Yay! Thank you MLC!!!
ETA: I think I figured out what to link, let me try this.....
ETA2: YAAAAYYYY IT WORKS IT WORKS THANK YOU SO MUCH MLC.
* fanseelamb gives @mustluvcatz a big wooly hug
EDIT: "BOO!!". Good gravy... yeah. I didn't even think of the handle/plate you added. So, you may have figured this out but you need to add a line for that in tsMaterialsMeshName and link it to your straight version.
I think that part could be made recolorable too if you want it that way. Not sure how many subsets the in game door has but your doors only have 1 subset. So it can be done...
Hmm. Separately recolourable handle. I guess that would be the more proper thing to do. Although I don't personally intend to use anything other than the metal and am slightly afraid to break the whole thing again. Perhaps I'll try. Not sure....
The handle. If you'd like it to be recolorable I'll make it that way for you when the doors are done. Because I'm greedy and want to be able to recolor ALL THE SUBSETS!!
* mustluvcatz accepts wooly hugs and would like to point out that she is not afraid to break things (not sheeps).. and in fact doesn't consider a mesh properly done until she's broken it a few times