There were so many versions of cowlings on these so I shot for the most popular. The earliest long nose had a 'shorter' nose with a cool, stylish S line for the back edge line of the cowling, which was also a vent, but a smaller engine, thus smaller airspeed. Dads was a long nose, but had 6 stacks, (like this green one), but most had two exhaust manifolds instead of 6 stacks. The short side scoops were on some as well, like again on this green one, but most didnt, so I left those off as well. Some cowlings had the wide opening at the prop for a big British spinner, like dads had, but I left that off also as most didnt have that, nor the big spinner.
The radial also had variations, like some had wider gaps at the join between fuselage and cowling. Some radial cowlings had a small bump at the bottom of the cowling, some had a bump on the right side. Most didnt, so I made the 'didnt' version.
So many versions of cowlings. That was nerve wracking. But at least the wings and fuselage were all mostly the same.