Well I'm back. Started off my week with a new update for Project Explore's preview build (0.3.0.1) and a couple hours at my day job. Exciting stuff. I may set up a stable build for Project Explore sooner than later. It may be missing a few of the key features but I think it is important that the majority of customers see that I'm actually making progress.
I finally brought back terrain tiles! I may eventually make them modifiable but for now the items that are tied to them are hard-coded.