Here's some slightly bigger pics from the CES floor earlier this year. This one shows the size comparison to the people walking below it. Fun to make, forever to print haha. I think the final count was just under 300 pieces (3 days printing almost non stop on 40 FDM Rep 2's)
Depends on the type, Nasa prints with metal for jet engines, China prints with concrete for houses. Gold? Yes probably on specialist printers. Some printers have their own software for the real world size calibration. As for manual, get some HQ measuring equipment build to scale in program, print off rapid prototype at LQ,…