All imports and most artifacts hide massive challenges once the skin deep facade is removed. Safety and Legality both come into play at this point. Massive amounts of restoration are usually needed to be sure material is repaired correctly. Destructive and non destructive testing, materials matching and proper application of process are needed to assure a safe, maintenance weapons system. With structural integrity addressed you then move on to correct aesthetics focusing on proper scaling and function. Maintenance and future upgrades will be less time consuming costly if property accounted for.  All of this requires a unique foresight and partnership with the end user and impossible without a very large capabilities base.