Peco produce 3 different versions of the kit, this is the 'wooden' version, which uses a laser cut MDF building shell and a plastic injection moulded roof plus other details. Peco also produce 'brick' and a 'stone' versions - those are available as all plastic kits.
The kit is supplied with a base, which to be honest is pointless, all that will do is make it impossible to get inside the building, if like me you want to add the window glazing after painting. Some clever types might want to add lighting too. Irritatingly, the discarded base clips in to the slots that can be seen around the base. I'll have to fill those in due course or hide them behind station furniture.