This should gives you some basics: https://www.nexusmods.com/newvegas/mods/76374
Night time and daytime windows system could be achieved via nif animation, Script replacement or External Emittance.
Sorting was made through LOOT which is not maintained for NV and thus create wrong sorting.
For the load order and priority, I strongly suggest to have a look at Viva New Vegas guide:
https://vivanewvegas.moddinglinked.com/
"out of the total combined Adjusted Asset count of 54,930 files, 18,008 are common to both games"
Here's an excel spreadsheet showing the asset differences between Fo3 and FNV
https://www.nexusmods.com/newvegas/mods/34774
I would look at a Vanilla nif similar in weight and size and copy carefully all the necessary settings in collision.
More about Collision types & settings, part 06A, B & C
https://www.nexusmods.com/newvegas/mods/76374?tab=description
and
https://geckwiki.com/index.php?title=NIF_Block_Types#Havok
In NifSkope:
https://www.nexusmods.com/newvegas/mods/76374?tab=files
Part 06A, B, C
In Blender:
https://www.nexusmods.com/newvegas/mods/76324?tab=description
I can only concur with what MadMongo said and suggest you to have a look at https://www.nexusmods.com/newvegas/mods/76374 to get the basic of a nif structure.