Unfortunately, the new Blockland update and the fact I overused static offsets would make this a pain to update, though it's not impossible.
Fortunately... a lot of the things in the original post might be added to the game! Badspot said he would add these improvements, though it would take effort in a PM. I answered some more of his questions yesteday. Stuff like occlusion culling would need a pretty big update, though, so for now it's just the bugs I originally described. Excitement!!