I'd love to have you on board, you're work looks pretty good although I'm really trying to stay away from the bland RTP tilesets. Here's what I'm currently looking for (pre-demo):
Main Map: Subsequent Maps
Island: Very large-scale beach, large cave, and a mountain pass.
Here's what I've got so far for a beach (using an RTP tileset), but, like I said, I'm looking to upgrade it to make it look unique:
Decent Sized Island City (Tavern, Temple, Barracks, Prison): Large-Scale Castle and Residential Area
If you need some more mock-ups or more detailed ones I'd be glad to give you some, however, I feel that your creativity will certainly add to it, so the choice is up to you. Like I said before, I am REALLY trying to shy away from the bland RTP stuff, so if you could use some other or reaaaallly make the RTP shine that would be amazing, mate.
Glad to have you on board Gnome!
Others are more than welcome as well!