mod I'm making is causing CTD

[shadowdef]

I've been gone for a while and decided to try and finish one of my old mods I converted it to run on SSE but it's unstable and occasionally causing a CTD. I've run Tesedit to clean the mod but honestly that seems to have made it more unstable. I haven't added and scripts yet and it's just a really basic player home right now so I'm not sure why it's crashing. Right now I'm thinking I made the interior spaces too large and that's making it unstable but even the smaller interior spaces seem to be causing CTD's. Anyway was hoping some one here might have some idea's. For those interested I've uploaded the ESP below. In the mean time I'll keep working on it. Thanks. 

BlackStoneCitadel.zipFetching info...

[MOB2]

Hi, did I understand correctly that you converted your mod from Skyrim LE to SSE? I did exactly that for my first house-mod, recently even managing to complete a small related quest.

Now, for the conversion I have read very important things about it. As I wrote in a comment to another mod I converted (Velothi Palace), perhaps you might find it helpful to check that you have also converted meshes and textures, unpacking and repacking bsa files, as well as saving the .esp file with the SSE CK (I would suggest updating it as Platform Extended).

The first time I converted Velothi Palace, I had an immediate CTD going in, precisely because I had not followed all the steps given.

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For the porting I basically followed the instructions on this page, but in summary I can list the basic programs used and the various steps.
I should add that I am currently using the AE version of GOG having not any particular problems, as I had using the non-AE SE versions of other mods.

So, the programs used are: BAE, Cathedral Assets Optimizer and Bsarch Pro. In the past I also used NIF Optimizer, but after discovering Cathedral I would say that it would be superfluous (and besides it crashed the game the first time when entering the house).

First, I copied the original compressed file into a separate folder, together with the links to the above-mentioned programs. I unzipped the compressed file, extracted the files from 'VelothiPalace.bsa' using BAE and passed the ‘meshes’ and ‘textures’ folders to Cathedral, following the instructions in the link above.

Then I recreated the file ‘VelothiPalace.bsa’ with Bsarch, again following the instructions. Finally, I copied the new bsa file together with the original .esp file into the Data folder of ‘Skyrim Anniversary Edition’.

Then, I opened the ‘VelothiPalace.esp’ file with CK (I currently use the steroid-enhanced version of Creation Kit Platform Extended, which I'd recommend to everyone), and simply resaved the file (while I was at it, I also changed the background music of the interiors, more Morrowind-like according to my personal taste: ‘DLC2MUSExploreSolstheimGeneral’.).

Actually, I found out later that Cathedral, in addition to optimizing meshes and textures, can also directly create the new bsa file, which makes it an excellent program in my opinion, practically performing almost all parts of the conversion, apart from the final save with the CK.

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Edited May 28 by MOB2

[shadowdef]

Thank you this is extremely helpful. I’ve spent a fair amount of time trying to google possible fixes and any information I could find on the CK without much luck. You’ve saved me hours of wasted time. 
 

It looks like I skipped a few steps in the converting process (most steps) so I’ll have to go back and make sure to do it correctly. Thanks for taking the time to help, it’s much appreciated.