Thank you very much, Steve ☺
Looks like I was first looking in the wrong direction with UV edit, and all that. Doing it like this works perfectly ????
Note to self (again): a lot of things are simpler than you might think at first.
I had problems with showing the text texture smooth. I leave it as a note for others that might experience this once.
I created part of the markings in Ps with text-objects (non-flattened) and was surprised it showed the text low-res/not-aliased like when rendering. No matter how high resolution the image and what “Sampling” setting I tried in the Alpha channel.
Finally, the problem was that when experimenting I’d checked “Mix Texture” in the texture-tag of the object. After un-checking that, it showed up great.