Das hakenkreuz ist Verboten !!
The "other" swastikas that you have seen are Finnish (which I believe are still in use, today). They are blue on white background, rotated the opposite direction, and have a totally different connotation.
Putting a different one in the same place will not fly, as the skin must be historically accurate (something you are required to provide proof of, by the way)
Leave it blank.
As far as the skin goes....
Still very "shiny". Play with the material settings (the text file).
Let's see some cockpit views. I can't make out any panel lines or rivet lines (or any other details for that matter)
The crosses are very bright and way too new looking. (think of the daily rigors, and environmental conditions that a wartime aircraft would be subject to in all aspects of skinning... scratches where hatches are being opened all of the time, ground crew with greasy hands touching thins, an sirty feet walking on th wings, scuffing the paint, etc)
Other than that, you seem to be making good progress
It's a long road