Mike:
As noted in the "Jimmy Casale" thread, Nostalgia 30 board here, you might want to first check with the folks at Flying Models magazine. They paid me for the construction article I submitted on the Box Car Chief which appeared in the December 1990 issue, thus FM may (repeat: may) own the rights.
Personally, I'd love to see this one kitted. It is a surprisingly good OTS performer, notwithstanding its oddball appearance. But it would probably be wise to check with FM before proceeding.