These look rather good Frank,
I'll be building the free kit today as little test compared to scalescenes into a small EWS yard hut. I'll post a picture up when i'm done. As a suggestion, maybe design a station thats different to the ones everyone else is marketing like the one at Woolston because you could sell it with different signage to turn it into council offices, police station, offices or even a grand old house. Therefore, increasing the usage of one kit instead of designing many and make it appeal to a wider customer base including wargamers (Thats what i see your focusing on at the moment) because it could be used as a staff headquarters.
All the best,
Lloyd