Today I received my decals which I had printed in Germany since this was the only supplier I could find who could print white decals. The first pages came scratched due to the mail delivery service. I also saw that the decals where quite thick. The second sheets were printed on a thinner foil and arrived in top quality.
Applying the decals was straight forward. I used a drop of dishwashing detergent to avoid bubbles and put a fine layer of water on the panel.
Tomorrow I will spray two layers of matt clear coat over it to protect the decals. Now that this is done I am ready to finally rivet the front top fuselage in place and install the avionics back in the panel. Hopefully everything will still work as expected.

