Thanks for your kind words, everyone!
The new update is out! I tried it with these tiles. The minecart tracks use the same texture as smooth walls, which makes it a little bit confusing, and it looks like a monorail.
Yeah, I'm working on a solution, with any luck I'll have at least hacky "texture-rails" going tomorrow, and will worry about the full directional things afterwards. I have at most 20 spare tiles, with 31 tiles necessary for perfect rail graphics, so it'll definitely be an interesting challenge (I'll probably try to overlap with rivers, like other people are trying)
I love it. How would i go about putting a creature tile set on it?
If you have a set in mind that is 9x12 or 12x12, it's as simple as pasting in the /raw/ directory from that set (both in the root, and your save game, mind you!).
Alternatively, to make your own set, check out the magmawiki, it has a great guide on how to create graphics sets.
I would like to have a more squared grid. Rectangles look funky when trying to build symmetrically 
A 12x12 square version is included, there just aren't any screenshots of it on the front page.