I was referring to SLA type 3D printing (such as with a printer like an Anycubic Photon or Phrozen Sonic)- done with photoreactive liquid resin. If you have been having parts printed for you, it was most likely done using this method. There are quite few of us on LSP who are using it now, including pros like Steve at Model Monkey, though his printers are VERY high end. SLA allows for much higher detail and quality, and the resin parts can be used directly in the build - no need to recast in resin unless you wish to make large quantities of copies. Those exhausts would have been the sort of thing that would turn out amazing with an SLA printer, though I'm doubtful it could improve on your finished product, as your quality is second to none. The only advantage is that it most likely would have been much quicker and less tedious than scratchbuilding them.
Again, your skinning abilities are inspiring, and continue to push me toward trying it myself. Is there a thread where you describe your process so I can give it a try?