shrike wrote:
Putting my "Used to do this stuff for a living" hat on.
Tasking tape, string, big rulers and patience.
While you could get stencils cut for the national insignia, you'll spend more time and effort getting them assembled, laid out and corrected than it would take to just lay them out in place with tape. That's the way it's shown in most of the factory photos I've seen. It also seems to be most common to paint the blue first and white over it, which is contrary to common sense and practice, but prototypical.
Ditto all of the squadron codes, they would have been done at base level upon arrival.
Tail serial numbers and N-numbers are small enough that computer cut masking is easy as well as being close to original (frisket masked serials seem to be common) Any local sign shop that cuts vinyl can do this for you, just do you homework on fonts.
There are several people here than can do oilboard stencils for the data block, or that could be computer cut as well
For mission markings, cut a cardboard stencil, trace it on the airplane in pencil and paint them in by hand. For extra credit, use more than one pot of paint and more than one person with a brush. Spray paint in rattle cans is a post-war invention.
One final thought on stenciling - production not perfection. If it's legible, it's good enough, there's a war on get it out the door and move on.
What he said. Scale it out, measure it, mark it, and tape it. If it passes the 10 foot test, it's good. I have painted many markings. No two aircraft are the same, just as no two aircraft use the same rivets. If you need any help, there are many here who would gladly lend advice

_________________
In California? Stop by and visit us!
Castle Air Museum