Making your own special markings can be much easier than you think in decal form,dont just stick to the colours shown in the kits but research the markings that interest you most.
The pictures show the different stages in making the decal,firstly lay a small piece of Scotch extra clear tape onto a shiny surface,a piece of glass,plastic sheet will do fine,next with a fine 000 brush paint in the design or markings required,you could even use permanent marker pens and then fill in with the enamel or acrylic paint.
Now with a scalpel knife carefully lift off the prepared decal and place into position onto the model,to make sure it is attached use an artists rubber shaper tool as shown ( obtainable from artists supply shops ) you can burnish the surface making sure that the edges are pressed well down,now with some Johnsons Klear ( sold as floor polish ) flood the surface making sure that the edges of the decal are sealed properly,this will blend in the tape nicely and also protect the markings at the same time.
This is a simple way to make small decals and is much easier than trying to paint them direct onto the models awkward curved ( and sometimes hidden )surface,all that you need is a steady hand and patience to turn your own designs and creations into easily made homemade transfer decals.