RE: covering cowling
If you try to iron on covering, don't use monokote, but one of the foam friendly ones. I suspect that by the time you monokote hot enough to start forming, the ABS will gladly start deforming. The windex metod will only work on a flat surface. You can pull it around a curve as there is zero holding power until it has setup for a couple days.
Try the Krylon Fusion paint. They have a wide range of colors and some matchup with Monokote colors fairly close. If you let it dry for a week or more, it is fairly Hot fuel proof. The thing to watch with any of the spray paints though it compatability. If you have tried one, then decide to try another, you may end up with a real mess as the first coat starts to bubble. I did that with a set of wheel pants and I ended up taking everything back down to the base and started over.
Don