The following pictures have been graciously submitted for your approval by our fellow Hyperscaler, Steve Mesner (also known as "the Snake formerly known as Steve").  While there aren't a ton of kits of this aircraft (Airfix 1/72 and a well-done 1/48 kit whose provenance escapes me right now), these pictures will certainly be useful for detailing the Army versions.  I will continue to look for Air Force O-1 variants in order to highlight any differences.   Many thanks go to Snake for providing these pictures!