Sometimes the craftsmanship and ingenuity of the members here amazes me. This is one of those times. Very nice indeed.
As far as actual scale, well there are always compromises. My favorite scale to think about is weight. For example the PRR S2 weighed in at nearly 1,000,000 lbs. At 1/48 scale that is still in excess of 20,000 lbs.
Just have to correct you - when scaling the weight, you have to do 'cube root', so divide by 48 3 times. So actdually about 9 pounds.