Thanks, that's a great help! Even [I]more[I] hours can now be spent on TW!

I've finally decided to give a mod a go. Vanilla Mod it is!
F:Gulp\Mildly_terrified\Convinced_you_know_what_youre_doing_though.exe

Hmmm... can cost and buld time adjustments be tied to events? That could make the Black Death a much more serious disaster management scenerio, for example.