A western region 16xx pannier tank for 4mm scale (not RTR) requiring more parts to complete the model. The supplied chassis is best for OO but the wheel arches should accept P4 wheel-sets (other chassis widths will be made). The cab doors can be modeled open and closed, as can the smokebox. The tanks are hollow to allow weight to be added. The chassis should be fixed to the body using a meccano (or similar) nut and bolt. A list of items needed to complete the model can be found here (please read): http://www.rmweb.co.uk/community/index.php?/topic/83722-twrights-cad-workbench-4mm-16xxptgwr-railcar/?p=1693533 I will be detailing the build of mine on that link as well. For this model extra details will be needed including buffers and whistles amongst other items.