After seeing the 1:1 pic you got the roof line perfect
I think Joe is right about the KW look and the big hood with the cab sitting along the top of the fender. That alone would change the look a lot.
Im not being a critic. I know absolutely nothing about 3D printers, saw auto cad at a university back in the mid 90's once but when someone is doing something as epic as this build, I feel it's only proper to share honest opinions and try to help out
Mario