Another thank you for the OriginX info, been trying to get that sorted for ages!

sweet, thanks for the response!

By editing the saved game. On top there is a value OriginX, specifying the place where the 5 tiles vertical stroke is on the map (also defines the visitor spawning spot. Simply changing the value will move the stroke to the left or the right according to your likings. Then you bulldoze what was beneath and replace it with stuff you want. When done, edit saved game again to determine where you want OriginX to be.

How did you manage to build over the default roads? I thought you weren't able to do that, even with the roadworks mod?