Hi, You got a good cab to start with. I was going to say that the reveal at the bottom rear of the cab looks a lot like a '36 Ford one, if you couldn't get a Dodge one, but it looks like you're a way ahead of me. One observation I have is this, if you're going to channel it you'll have to cut away some of your new rear panel after you've gone to a lot of work installing it. I'm just finishing up a '36 Ford, so some of my knowledge hasn't even been forgotten yet. I agree with Bruno on the mid '35 changeover.
Keep on tinkering. L.B.