Hello Stellan,
I really like the color choice you made for the cowling. I use the same Dark Sea Blue colors too, and it looks just right to me... 🙂
These Tamiya Zeros are a beautiful kit to build. They fit so nicely and look so good once they're completed. I like what you have done with yours, and it's going to be a masterpiece ! It looks magnificent already, and you still have to add the Swedish camouflage paint.
As far as the multicolored stripe decals you mentioned earlier: Number 43 and 44. They go on the exterior landing gear doors and it's a visual reference / aid that shows how compressed the main landing gear struts are. When all three colors were visible, the plane was most likely empty, and not loaded with fuel, ammunition, and ordnance. When two colors were visible, it was a quick visual indicator to show the plane was loaded. I believe that all three colors were also visible once the landing gear was raised, The outer gear doors are a two part assembly, one is fixed stationary to the upper portion of the strut, and the other is fixed to the lower and this allows it to move, thereby making it look differently as the landing gear is compressed.
Some aircraft have a landing gear system that allowed the ground crews to add compressed air into the oleo strut when they plane was loaded more heavily than usual. The Junkers Ju-88 was like this.
I'm not sure if the Zero had this feature or not... Maybe this is another possibility ? Hopefully someone else with more knowledge than I have about this can chime in and add comments.