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Other than the steering problem and the electrical the frame may not be as easy to adapt as you think. Width and
wheel base issues may slow you down than if you did a better frame.
There was someone over on Garage Gazette - Index that did just that.
He also used 2 beds to make 1 long one because I think the cab was shorter being COE.
It was a lot of work and vary well done. He started having health issues to the end but think it was driving.
I went to look for it and I could not log in? Had to rejoin and could not see anything older than AUG 2018?
A little more digging and it looks like they had a server fail and they went with start over "new" than to try and "restore" what they had.
They did have a link to some older stuff but could not find the COE post.
Maybe you can try posting over there in the "projects car / truck" area and ask if anyone remembers it.
Good luck.
Dave ----