I suggest you finish a scrap piece of wood the same as your cougar and test the clear over a spare decal before committing to your model. My experience has been that you can put anything over anything as long as you spray very light mist coats which is sometimes easier said than done. Its tempting to spray a wet coat, but that could easily eat your decals or cause them to curdle.
The solvents in Klass Kote are fairly hot, so I wouldnt even think about spraying them over anything that I was concerned about without testing. I did spray it directly over an ABS cowl in a wet coat and it didn't cause any problems, but I would not do that with decals. If you want an absolute flat finish you can use the Klass Kote flat catalyst.
If you want semi-gloss then you can mix some gloss catalyst with the flat and mix the result with the Part A (paint). More.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.