I can understand where you are coming from in terms of height of the wagon side but, in so doing, you have changed the appearance of the side, as per this. It is always the problem when things are made too big, everything gets stretched, so when you cut down to get the size right, some of the detail goes.
https://www.google.co.uk/search?q=irish+cement+wagons&client=safari&hl=en-gb&prmd=sinv&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjJj67844zXAhUEXBoKHezJCI0Q_AUIEygC&biw=1024&bih=672#imgrc=HAzGfDL6iwNiiM:
Stephen