Thanks. ;-)
It can be challenging sometimes working with the perspective, but it's let me do some interesting things. I think it's well suited to the kind of game I am making. If it was more of a general management/construction style sim I would want to go with isometric. But with the play area fixed, and the focus on the core game loop with narrative, this seemed like a more interesting way to go.
What I'm working towards at the moment is just getting the play space properly knocked into shape. That's all I've been doing for a few months now actually! Still a few more months to go. Once the foundation is good to go I will begin to introduce actual gameplay elements.