Perhaps i was being ambiguous regarding "changing" - could refer to editing existing buildings or changing them them , ie making new ones?
probably because I was in a rush and haven't even read the tutorial yet and wanted to let people know the tutorial was available.
(I have, however, played around with earlier versions of the IWTE prog - which is how the RozMod has the ambient buildings as forts option -
something I still haven't worked out the best way to utilise.)