I think I agree with everyone here - it looks fantastic! The double doors are perfect, and as Red Orc suggests, you could simply have a yard at the back that they lead into, which would look cool. I love the girder over that high window, I love the rooves, which look fantastic, the shop - as always - looks superb, but I have to say, one of my favourite bits is the chimney! It's incredibly well done, and gives it that certain 'something'. This is going to be another fantastic building, and I can't wait to see it alongside the other buildings you've done. Great work! Oh, and I like the idea of an automaton workshop. In fact, if you're looking for possible 'Walker' models, there are a couple in the Warmachine range that would look great - check out the Heavy Warjacks in the Khador, Cygnar, and Mercenary factions. There are a few that would be perfect, particularly painted up in your (patent pending) black and gold colour scheme.
Fantastic stuff!