In the first picture you can see a pocket made from sheet metal. That was V.1, V.2 was rounder and made air passage a "breeze"
Interesting carb mounting, I saw it somewhere else and the first thing I wondered was how does the air get to the cylinder from the fan, with a big hole and carb in the way? Does it get hot on the freeway?
Once riveted in I sealed it with black RTV, air flows really well. the small stints i rode it on havent been an issue.