The kit is composed of a laser cut MDF core overlaid with laser cut siding. This is a fine kit with lots of assembly enjoyment and quite easy to build. Its what makes building kits fun. The kit has wide appeal and will fit any model railroad from narrow gauge to standard gauge modern themed railroads. This is a redesign of a much earlier kit. Try one today! Overall foot print is a scale 11 1/2" wide by 5 1/2" deep..... .