These are generally done based on custom upscales of vanilla diffuse, with some full replacements and new normals where the old weren't worth the time or effort in recovering. The architecture and dungeons that will be included in the release follow a similar process.
no rush! :D your texture updates are well worth the wait and i believe your SI update should pretty much cover most if not all texture mods for oblivion, especially Crucible!
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I have a second sticky on the 2020 RTP page where I'm loosely updating progress as I go as well