Probably my oddest model so far. I used the Dornaplas plastic kit for the Bristol LS as the basis for the body. You can probably see where the wheel arches have been filled in as the bus is only in it's initial coat of paint. The chassis is from the Marklin 4 wheel railcar which runs quite well, but is rather noisy. It has a coupler at the rear and will haul a small tail load. In fact, it's actual hauling power is far in excess of the real thing.
Below you can see the basic components. The body just slips over the chassis and grips by friction alone. This is quite adequate. Once the body is fully painted and glazed, the roof will be stuck in place. The mouldings are commendably thin, so the roof will add a great deal to the strength of the model.