Hello.
I have read Gwx's manual (1.03) and with the exception of a detail, everything was nice.
The detail is the following one: The AR-196, OS2U-3 "Kingfisher" they are the same plane.
The OS2U-3 "Kingsfisher" had a only float. It's a oblivion, simply clone units, laziness to modeling a new plane :p?
Regards.