If you are going for a 379 look, the windshield shape is different between 379 and the 1100-cab (359). You can "cheat" by reshaping the corner radius of the windshield and reworking the center post. The 1:1 cabs are much different, but with subtle modifications you can create the look needed. Also, the side-of-cab fresh air vent should be eliminated for 379. Also, the roof is shaped differently - the 379 has a more graceful shape where the 359 is squarer. Sanding the leading edge, rear and the shaping the outer ends will lend a 379 look to the roof.