Just a few further things I've noticed testing it on 1.12.2:
-potato textures are reversed. baked is raw and raw is baked. Was easy enough to fix by just renaming the two .png files. I know that one's not on you because I remember having to do it to the original version.
-single upward facing iron bars without supports have no textures. If they're connected to other blocks horizontally they show up properly.
Those are the main things. Glad to hear there's work towards a 1.14 version. It was great being able to pull this out for another Vechs map with Iceolation coming out.
The Meaning of Life, the Universe, and Everything.
Also, here's some pics of the mod support I've been working on. Mostly Biomes o' Plenty woods and other natural blocks. Also has Thermal ores, but no machines or anything (at least not yet). No GUIs yet either. Everything is edits of SMP's textures. Still looks pretty good, nothing really sticks out.