The future is here folks, I know the items are favorite WWII aircraft, but watch the video.
All designed to be printed in sections, glued together and hey presto you can have an airframe ready for power plant/controls, the only limit is how many 3D printers you have access to.
Upgrade the design on the fly so to speak, simply send out an updated printing program.
Want it printed in colors, no problem.
All the design, build, test, certify if need be, done at one central location.
If you really want to produce en masse, this is the way to go:
https://3dlabprint.com/
There are other companies out there just getting into this field, just Goggle 3D printed planes.