This is my startertown-map:
I've tried to combine the three elements of this place (town, forest and sea) as good as possible. About border errors, they will not exist, because the player will not be able to sea the borders of the sea, as well as the coast. (The mountains and stuff.)
Oh, and, if the treeshading is a problem, somebody should explain me what's the difference between the two types of treeshades.
About the lab, Pepito wanted it to be a threefloorsbuilding.
If this looks, in your eyes, like a tile error, we can always make the lab like the original one, and make a basement.