Locomotive works design

I'm looking to put a locomotive works in my layout mid to late steam era taking up about 4 by 1-1.5 feet with a 2 or 4 track mainline going through it in HO scale Any design ideas? anything would be great!!

try this as an engine
www.trainworld.com/manufacturers/model-t...ht-4449-4-8-4-50201/