This kit is laser cut plywood with a basswood overlay. Included are simulated metal overlays including the lock plates for the doors. The kit is relatively easy to build and fits Bachmann's 1:20.3 Gas Mechanical. This is a great conversion and will add something different to your railroad. The side windows in our model above are covered over, you can leave the boards off to give more of a crew cab look. We use it on our railroad to haul the tipper cars out of the pit...