Hi.
Thank you very much for your help!
I've now regenerated from scratch and used ctrl-a to get everything from DynDOLOD_SSE_log.txt
Sorry for posting an incomplete log last time - I was following the time stamps as I had run it several times and didn't want to dump a bunch of unnecessary junk on you. In any case, if it's useful, I'm also including the only other file in the log folder: LODGen_SSE_Tamriel_log.txt
As for the mod, yes, it's the one that contains ACatsLife.esp.
I didn't run DynDOLOD 3 Alpha initially because I had it in my head it was only for version 1.6.x of Skyrim, but now I see that was a misunderstanding of the mod description. Now that I've run it, I really enjoyed the advanced error handling it has (it helped find several records that needed to be repaired) and was able to complete the run without the same error as above.
To double check it wasn't any of my fixes that actually resolved the error, I ran DynDOLOD version 2 again and it still came up with the same issue - however, now that I can run things with 3 Alpha, I'm happy to just go forward with that. Thanks again for your support!