Have you tried playing with RetroDays? I found it quite good, after I got used to it!
And, as said in its (RetroDays’) thread, the only missing tiles are the ones related to the new substation building and the zombie technicians - as far as my experience goes, these were truly the only ones missing.
In another thread, I think in the one regarding Tsu’s tileset, he explained why the tilesets are not updated so frequently (his in particular); the reason was related to associating tiles and their respective item ID (if I understood correctly), which would be a pain to do. (I’m inclined to believe it, haha.) Also, the experimental versions come up with a lot of things that might or might not make it to the stable, so it kind of discourages keeping the tileset up to date with them.