Geoff and I don't usually work from drawings ,the concepts are taken from actual buildings and then lengthy discussions on how we can adapt to end up with an actual idea that can be made up in scrap to ensure sizes, shapes .work !
The biggest lesson I have learnt some buildings just don't scale down well to keep the integrity on the tabletop
Always be prepared to adapt and adjust as you build........and don't be afraid to admit an idea just doesn't work!