Has anyone tried the Cornerstone/Walthers HO building detail kits? I have assembled the tank kit and the roof detail kit. They make great n-scale details. The vertical tanks are 2 stories tall and look great with the Roberts Printing kit. The plumbing even works in N. I built the horizontal tank as 2 3-panel vertical tanks. They are excellent bulk storage tanks. The roof details work for any industrial buildings. The large a/c units I am adding as a heating/cooling addition to a building.