One little problem - since all you have is essentially bent (sometimes subtly) or worn parts, how can you determine what the original spec was?
As several DoD studies have pointed out even in recent years, the expense of reverse engineering the A-10 would likely be greater than just starting over. Which is honestly what we probably should do - not slavishly attempt to reverse engineer what went before but design a new one along the same lines. I wouldn’t be too surprised if there were some Boeing engineers who worked on the wings working up something for the fuselage and tail empennage now on their own time.
You would have to understand that once the surfaces are scanned in, there are commands that allow the smoothing to tangential intersections between all of the thousands and millions of polygons that make up a surface scan. We have scanned an entire racing car to include the wheels and tires to build solid models from. the scan was so accurate you could see even the thinnest irregularities such as decals and paint lines easily. We merged those surfaces tangent to the actual body next to it, applied the tangent joining and once the other features such as mating flanges, were able to cut new mold bucks,after correcting left to right symmetry, on a large 5 axis router to a cutting tolerance of .,005”.
As for original spec for the re-engineered piece of an A-10, that is contained in the grain structure and the metallurgy obtained in the destructive testing of an original throw-away piece.
Of the scanned piece optimized, that piece should also be subjected to CFD (Computational Fluid Dynamics), or wind tunnel in a computer, to further optimize its aero properties as a part of the optimization process.
If you go to this site, the model on the home page header is our initial design of a Cadillac CTS-V designed for road racing. The original car in its stock shape was over 52” high and a wheelbase of about 113”. This design was optimized to be 45” high and a wheelbase of 102”. Also, the widening of the fenders and nose to include the splitter as part of the carbon fiber body pieces was all designed
http://www.karalit.com/index.php?option=com_content&view=article&id=63&Itemid=45