Another fine kit from Walthers. The pieces are all straight and fit together correctly. There is minimal flash (mostly in the gratings) and a few mold lines that need to be filed. Assembly is easy. The hardest part (unless you are smart enough to place the structure before laying track) is cutting the track, making the hole for the pit, and then replacing the track so it is level. The slots for the track appear to be designed for code 100 track, so if you use smaller track you will probably need to shim the model. My only complaint about this kit is that the track just sits in the slots and must be glued into place. It would have been better if the track could have slid under retaining clips for a more positive fit. Anyway, the kit is advertised as coming with an office building, which it does, but it also comes with a small guard shack and pieces for making quite a bit of chain link fence, including some thule with a very tight pattern. This was a welcome surprise as I can always use chain link fence.