Unfortunately [V] this is one of those times where what one sees is what one gets and that's all she wrote! In this case, a single picture of not particularly good resolution is probably all we'll ever have of this what-if. 
QUOTE: Originally posted by Poniatowski
Cool! Nice concept sketch. I'm wondering where the driver's door and side window is!
I think you're looking at it: the roof, probably hinged, with something like jacks to raise it and to hold it up. Would it've been practical? Heck, no! Just remember, the whole thing is Radebaugh's airbrush painting of a wartime brainstorm, thus idealized to the nth degree and missing li'l details like doors and hoods. If you like, think of them as "extra cost options".
QUOTE: Originally posted by Poniatowski
An M3 is bad enough to drive without any vision to the side (kind of like maneuvering in a shoe box).
Allowing for the fact that this was only a concept (and one rejected by the Army at that), there could've been some side vision. The gap between the roof and the side panel has been greatly foreshortened by the artist's elevated perspective.
What looks like a slit in the painting may've been conceived as being a window a yard wide and several inches high.
QUOTE: Originally posted by J-Hulk
The rear end kinda looks like an SdKfz 251C, does it not?
Only if one squints.
One open topped, angle-sided, armored box on treads looks a lot like any other open topped, angle-sided, armored box on treads. I doubt that A.C.R. was trying to rip-off
a "Gepanzerte Manschafts Transportwagen", but one must admit that the *** got there first.
QUOTE: Originally posted by Peridexion
I bet this guy designed some really cool toasters!
And at least a half slew of other eye candy as well! Google "Radebaugh" images and see!
Occasional factual, grammatical, or spelling variations are inherent to this thesis and should not be considered as defects, as they enhance the individuality and character of this document.