Creators of Non-Matt Kania Ringmasters?
 

Matt Kania AFAIK is credited as designer for Sterling Models kit numbers S1, S5 and S13. The designers for the others are still shrouded in mystery. Anyone have ideas on who the other designers were for these Ringmasters?

S1 Ringmaster - Designer Matt Kania
S-1A Ringmaster - (Modified for modern iron on coverings)
S-5 Ringmaster Junior - Designer Matt Kania
S-6 Super Ringmaster
S-13 Baby Ringmaster - Designer Matt Kania
S-18 Ringmaster Imperial
S-22 Ringmaster Sportster
S-26 Custom Ringmaster - (Promotional item for a contest)
S-29 Ringmaster Junior Flash
S-30 Beginner's 1/2-A Ringmaster