All done by hand. The only pre-formed part on this whole build is a tiny strip of ridged plasticard on the fuel tank cap. I doubt i will ever get into 3D printing. For me, working the material by hand is part of the fun. I still draw with pencils and paper, rather than on a tablet.
The only time i would use 3D printing services, is complex shapes like wire wheels. This is the main reason why a DB5 model is not yet on the horizon.