RE: Surface prep
Well after much experimenting, Monokote does not stick to plastic very well, with both the solvent or heat. It will stick, but comes off too easy for me to spend the time to cover it with the film.
I compared stick rate with applying it to the stab of my B17 and to the cowl, left a bit of film unglued on both and after cooling, gave them both a tug test with gravity, and it came right off the cowl but stuck good to the wood. When it came off the wood, part of the wood stuck to it.
Looks like I will be going with a modified scheme by using a red nose like Princess Elizabeth has in blue, so that I can stay with the red tail and yellow stripes with the highly polished skin. When I look at the placement of the paint lines on the cowl, and compare them to the model, then the line falls right behind the plastic cowl, so it will be painted. The only part I will have problems with then is the radiator scoop under the wing since it is also plastic.
BTW the cowl plastic does take a good amount of heat without softening or deforming.