Likely the only difference in the two cab styles is in the door hinge area. If you took a closed cab and made this area smooth like in Cliff's pix then chopped off the roof and made up some windshield posts nobody could tell the difference. On those old Chev and GM trucks the firewall and hood are the same shape.
If you could find the front and rear axles off a C15 CMP they'd have the bolt pattern you'd want and likely be the right width. Otherwise just drill your hubs to the military bolt pattern and bolt on some CMP wheels. It'd be a great project. Around here I could get dozens of those old 1.5 ton Chevs. In fact I already have a couple that I used for parts.
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1940 Cab 11 C8 Wireless with 1A2 box & 11 set
1940 Cab 11 C8 cab and chassis
1940 Cab 11 C15 with 2A1 & Motley mount & Lewis gun
1940 Cab 11 F15A w/ Chev rear ends
1941 Cab 12 F15A
1942-44 Cab 13 F15A x 5
1942 cab 13 F15A with 2B1 box
1943 cab 13 F15A with 2H1 box
1943 Cab 13 C8A HUP
1944 Cab 13 C15A with 2C1 box
1943 Cletrac M2 High Speed Tractor
MkII Bren gun carrier chassis x 2
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