"I am pretty sure that my first reaction to seeing that tiny test chamber would be to say, 'Hmmmm. It's a bit smaller than I expected. Could you show me the drawing that you were using?' I am not sure, but there also might be a tickle in the back of my mind that the only thing that could cause a modelmaker to make a perfect scale model of what I requested would be if I screwed up the dimensions somehow. Like when JPL (Jet Propulsion Laboratory) and Lockheed Martin didn't communicate with each other about what units each was using to design and build a Mars lander, and it ended up crashing because JPL used the number 9.8 m/sec/sec for acceleration due to gravity, while Martin Lockheed was using 32.2 ft/sec/sec. My first guess would be that it was a mistake of mine that caused the dollhouse test chamber to be built.
I think I would be tempted to ask where my dollhouse laboratory was, and if he would also be making the test samples to fit into the microchamber. Also, tweezers. I would need tweezers to set the little samples in there. If I could, I would keep from laughing, but I am pretty sure that would be impossible. I know I shouldn't laugh, because the modelmaker wasted company resources to build that desk ornament, but on the other hand, this lesson might keep me from making a similar but less obvious mistake in the future that would waste a lot more company resources to correct.
I would probably quickly reflect on the fact that I may have to work with this modelmaker many times in the future, and better to invest a few company dollars in that relationship right now than to contribute to a sour, adversarial environment by being righteously indignant."