Here's a small update for you folks not on the facebook groups (why?).  I have managed to get the tool into a better working state and all seems to be going well with the development.  Our beta testers noticed a strange glitch though that now needs looking at.  It would seem that if you use the hack to to add megabucks and use them to upgrade railway things it works fine.  Yet use those same artificially generated megabucks to upgrade the airport and it doesnt stick.  Very strange.  Will post back after looking at it further.  In the mean time head to the Facebook page and become a beta tester as other than that the tool is working great.