As Jecowa said, only possible for the soap maker at the moment. I guess you have to ask mifki... he is working on creature transparency at the moment. So there are certainly improvements to TWBT that are still in the making.
How detailed will you do it in the end? I always thought GemSet covered everything, but lately I looked into trees more and suddenly I have close to a full tileset of 256 new tiles just for trees. It's crazy, they have so many sub-tiles like leaves, woods, pollen, seeds, flowers, fruits, picked fruits, saplings, dead saplings... unique for pretty much every tree.