Dennis Tapsfield designed a scale Crackerjack in 2 sizes, published in England by Radio Modeller. The plans are still available from MyHobbyStore see http://www.myhobbystore.co.uk/search...=crackerjack&=
Plan number RM284 and RM286

They also supply a copy of the article for 3 pounds ( not included when you buy English plans! )
Sometimes Dennis Tapsfield had the same plans also published in US magazines such as MAN or RCM.