Tasca has built up photos of thier M4A3E2 Jumbo up along with marking for 2 75mm gun tanks and two 76mm (looks to be two 76mm barrels one with collar and plain barrel)
http://www.tasca-modellismo.com/seihin/m4a3e2/m4a3e2.html
Jim
Looks like it has all the right stuff…
Darn, no Cobra King decals.
I wonder if you decide on the 76mm cannon, can you put a .50 cal as the co-axial? Cobra Kng had this configuration after getting upgunned in early 1945.