Tom, the only O scale Korber items I have on my layout are the 305 and 305A sand house and tower. Even these were modified to fit the space available. We were able to get a lot of S scale items from Twin Whistle that fit the desired scenes. We use a lot of HO structures, some modified with taller bases and doors. The Walthers catalog was a good source for these larger HO structures like a Union Station, oil tanks, rail yard buildings factory structures and power plants.
In general it was easier to use larger HO items that to cut down O scale items.
