Finished carb heat box, and fitted air filter box.
I decided that I wanted cold air intake, otherwise I could have just clamped the filter to the side of the carb heat box. This should give me a little more power, and hopefully help the engine run cooler too.
The most difficut part of building the carb heat box was that solid flush riveting. It was a job that almost required 3 hands. In hindsight, I might have been able to use flush pull rivets on most of the box.