Currently trying to model some Swiss rolling stock to fit a 20m unit.
Material used is just styrene sheet and should literally just rest over the shell of a 20m motorized unit.
Will not be 100% accurate as the only tools being used are a pencil and a std steel rule to mark out and then cutting with a small knife bought from the £ shop.
Cutting the openings for windows has been a challenge.
Photos will be posted when I am happy with the rrsr