They would do best to copy a Yanagisawa. 
Failing that, I would like to see/play a bent neck, straight sop with a fixed neck (not removable). No high G, please. That would put the horn in the years of the Mk VI to SA80 (aka Serie I). FWIW, I agree with Grumps that some of the best earlier vintage sops were from Buescher. Buescher was making quality sops long before Selmer figured it out.
Failing that, I would like to see/play a bent neck, straight sop with a fixed neck (not removable). No high G, please. That would put the horn in the years of the Mk VI to SA80 (aka Serie I). FWIW, I agree with Grumps that some of the best earlier vintage sops were from Buescher. Buescher was making quality sops long before Selmer figured it out.