Lots of nice guesses that don't make a lot of sense after a more careful analysis. > - photography and modern printing, making it vastly easier to distribute h

Lots of nice guesses that don't make a lot of sense after a more careful analysis. > - photography and modern printing, making it vastly easier to distribute high-quality copies of reference images to craftsmen Likely less than 0.1% of actual work to be done > - thermostats, allowing optimal heat/humidity for amber work at any time of year If this wasn't necessary during the original construction, why would it speed up reconstruction? > - electric-driven tools (drills, saws, polishing equipment, etc.) Given how fine the details are, it's unlikely that anything but manual labor and hand tools were used. > - better and faster-drying adhesives and paint One of the features of the room is that it's made from materials that don't require paint, e.g. it is natural amber and gold plating (or solid gold?). Not sure about adhesives, you may have a point there. > - personal protective equipment (e.g. masks and goggles), allowing craftsmen to work longer continuous hours without risking their health There's nothing much hazardous about gold or amber. > - better and vastly more ergonomic optical equipment (jeweler loupes, microscopes, etc.) The details are fine, but not that fine. We're not making the smallest wrist-watch in the world here. This is evident from wiki pictures.