I remember plying this game oh so many years ago and completing it many times over. So glad that someone decided to make an Open Source clone of such a great game.
Wish I knew how to code, but I do not. So all i can do is offer suggestions.
May I suggest that you talk to the fine folks over at www.openttd.org
They have created an open source clone of Transport Tycoon deluxe, and may be able to help out with this project? That is of course unless you are already talking to them....