As far as cowls and wheel pants, you can make a plug and pull a mold, I might do a write up with kinnflyer about this along with "glassing 101", as far as the canopies go,....there are many ways to make one, some can be simple cub like windscreens, and others can be almost impossible to mold. The trick is to find something premade if possible, if not, learning how to vacuum form your own with a good plug. Other than that, there is no limit to what you can do when building scratch, some people just don't know the basics to get started.