To support this fascinating account of Stinson ops in Burma and India, here's a fine picture of a Stinson L5 on casevac operations, showing the long side door which hinges down so the stretcher can fit down the fuselage. The L5 had a six-cylinder 190 horsepower Lycoming O-435, more powerful than the contemporary Austers used by the Army Air Corps, and was also shorter – hence the very large empennage. Stinson seems to have got it right as the post-war Auster AOP9 looks almost like a copy.