All-   @nmayhew and I were discussing the differences between some of the features on the A-20 Havoc, so I wanted to start a thread here so folks could see some of the differences. The first topic we'll cover is the cowlings. Others, please feel free to add other bits here as well.   The A-20G/J/K series started with an early version of cowling, which was clean until the cowl flaps, which were scalloped to accommodate the individual exhaust stacks that exited the rear of the