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Hello All:
I ran across this and would like to know if anyone has a topview/drawing that I could use to scratch this vehicle using Tamyia's M3A2 as a base.

Thanks in advance:
Robert
I have only seen the retouched photo posted here, but it shouldn't be difficult to work out the dimensions using the body of the halftrack as a reference point. The color drawing doesn't match the photo, since it's evident that space was left around the sides of the armored roof to allow observation (and ventilation).
That said, Tamiya's M3A2 kit has the ladder shaped stowage racks molded onto the body sides, and removing them would also destroy all the screw detail, and replacing it would be a nightmare. The Tamiya M21 mortar carrier could be used, but the Dragon M3/M3A1 halftrack would be a better starting point with its superior suspension details and styrene track (even though most of the screws on the bodywork don't have the teeny slots molded in them).
Patton used this vehicle during training in the America Southwest. It did not go to North Africa with him (or at least, not in this form). Patton used a less drastically modified M3 Scout Car in Tunisia rather than a halftrack.