Are all 1930-31 pickups this way?

[Vin-tin]

I need a few questions answered from someone that restored a mid 1930-31 closed cab pickup.
First off, I'd like to say that this truck cab was completely taken apart by one of it's previous owners. So figuring out how exactly everything goes has been a challenge for me.

(Middle picture) Is this gap normal, where the sub-rail, rear cross channel, and b-pillar meet?
All rivet holes line up, so I'm thinking it's normal.

Also, I got this repo cab corner patch along with my truck when I bought it.
The flange on the front is too narrow. The body-line is "open" on the end, and the radius of the whole patch seems bigger than it should be.
Plus, to make matters worse, the previous owner got carried away and cut too much metal out for the patch to cover.
Is there a more accurate cab corner patch available from someone?
It also would be nice to find one taller than 6" so I don't have to weld in a small filler strip.
Sorry for the poor picture quality.