Thank you so much.
With your input I have decided to make an original character / adventurer first, where the floor for what I will consider is decent quality is much lower as it's not building on top of something created by Obsidian.
I will start with the character's unique item and then some prototyping with whatever 2D graphics that can be changed and trying out adding custom player command acknowledge wem's.
I love Durance's chatter...
"Light, flame, and sound - we'll keep to ourselves."
"Magran's fire casts light in dark places."
...
And, if custom 3D geometry isn't possible, is it possible to at least have custom 2D textures? Say I want to have a new texture on some clothing?
Because I'm thinking, shouldn't there be source paths referenced by items and such? I've seen that the expansions have their own bundles, and in the expansions they must surely be referencing assets from both the base game and its own new stuff...