Finally, after several years of constantly searching, found a replacement Mayhem, NIB. Had even drawn up new plans for most of the plane to make a clone. Turns out when compared to the original, my drawings are spot on for size.

Very difficult search. Since they don't come up very often, a complete, NIB plane was a very fortuitous find.

Best of luck to everyone else who misses theirs, as I did, and is still looking. Just don't give up.