Bourneman's book is very helpful because it shows the snowshed being torn down right after the tracks were removed. Maxwell (again) had some section drawings showing the different style construction to span the cut and some details of a typical section. It completely burned in 1923 and was replaced then.
Some details that I have noticed: The West end was replaced around between the 1930's and the 50's and is sheathed in corrugated siding.
The vertical members are round timbers, possibly piles
The typical siding was about a 1X12 overlapped as drop siding. The roof had smoke vents and more removable panels directly over the tracks. Possibly these were removed after the snow season for better ventilation. I couldn't imagine how smokey it must have been in winter
The turntable was spanned by two steel girders from a scrapped turntable turned upside down, With large I beams bolted underneath them at 90 deg.
It would be a massive project to duplicate this structure in any scale.
My model has no cover over the turntable and has my model of the Cumbres depot. That really is Mt Ouray in the background, taken just to the right of the cut.
Bob Meckley