Given access to the correct tools,that is do-able in metal.
I'm not too familiar with this year/model,but is this a common rust area?
I think trying to find a scrap cab and cut your replacement metal from that,might be an option.


1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.