With Eigiau for comparison
The other thing I've done is make a sort of Crewe tractor using a plastic kit for a Model T Ford in military condition and a Portram chassis for power. I made up the car body pretty much as nature intended leaving out the steering wheel. The Portram bogie is glued to the rear and I've used half a Parkside WD bogie as a front pony truck swiveling on its usual pivot.
It is painted grey (as you can see). It runs nicely but with some added weight it is much better so I've glued a spare dome in the back as ballast.