Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

For me:
Function is more important than form.
I don't have expensive engines, so that factors in as well. Of course, I prefer originality but for example, on my big Doll orphan, 90% of the original is gone. It would be foolish to restore to original since it would be prohibitively expensive.

For Mamod mobiles, keeping it not original is usually the most important thing. They made so many.