That's a sweet looking pic. I'd suggest using decal film. I believe you can paint the decal film, and then cut the strips to be applied to the framing. Never done it myself (yet), so I really don't know what kind of paints to use or any other technical stuff.
The other thought I just had is to just mask off each section of straight line and spray. The trick is getting the line to uniform width. I saw a tip once where a person just put to #11 blades side by side in the same handle. This allowed him to cut extremely thin (perfectly parallel) strips for pin-striping. If you just took some tape and cut out a narrow strip in the middle, you could use that to mask the area and then just keep moving it whenever the direction of the line changed (make sense??) Come to think of it, you could also use this trick to cut the decal strips (if you went that route.
PS, if the #11 blades didn't make a line that was narrow enough, perhaps two razor blades side by side would be tighter (the flexible double-edged ones).
Good luck! Love to hear what you discover.
Murray