Oh it will drive me batty if it works, to be sure. Especially since ALL of my plots use custom LOs just about - so the fact that the others didn't crash but these did is completely nonsensical. However, @msalaba raises a good point - when you create a static collection (SCOL), which is what we builders use for the construction stages in many cases, you combine a bunch of statics together without necessarily saving it as a separate file. The game engine uses a record to basically render the SCOL on the spot. In these cases I've looked at the SCOLs and there should be nothing out of the ordinary, but for some reason the XBox is just struggling putting them together and crapping out. Something in there, as @msalaba said - is something the xbox doesn't like.The thing that weirds me out though, and I’m sure you as well, is… sure, you could try this sort of fix, but how does it make sense? What if it works? What about all these plots is the same thing going wrong that is different about other plots?
I mean, if it worked, huzzah, but it would drive me just as batty as if it didn’t.
However, the final construction stage of each building level is typically a full NIF. Not in every case, but in many of them. In those cases, all of the different elements of the SCOL have been saved down as a finished file. This is easier for the game engine to process because it doesn't have to construct the SCOL from the bits and pieces, it straight up pulls the NIF file and just uses that. So if I make this fix and it works, it means that something in my construction stage SCOLs is specifically throwing the Xbox off. I will have NO IDEA what it is, mind you, because none of the stuff in any of the SCOLs is a custom asset, and I would have to take it apart piece by piece and test each time to figure out what the offending chunk is. Even then, it may be the sum of its parts that's causing the problem and not a specific piece - rare but possible.
If the NIF itself proves problematic, well, that's a much larger problem that will be a true baffler. That does likely mean that the plot will just need to be excluded from the xbox version of this mod. The tradeoff, if this works, will simply be that you don't get to see the building slowly come together over stages. What will happen is as soon as it starts constructing it will immediately go from the scattered building materials to the final structure. That may break your immersion (sorry), but at least you'll have a working building plan.