Quoted from viperrwk:

As the story is told, Game Plan was started by Wendell McAdams (of Chicago Coin), Lee Goldboss and Mike Abrams. The company did eight cocktail pins before doing it's first conventional game - Sharpshooter. Roger Sharpe was brought in as an outside consultant and he drew up the design of Sharpshooter at the request of Goldboss. Sharpe says the layout was a modification of Gottlieb's Sky Jump with the bottom bumpers inspired from Williams' Satin Doll. McAdams said it would be too expensive to build but Goldboss green-lighted the project anyway.

I read this as well and that the parts were loaded into a barn outside Chicago where the roof collapsed after a snowfall and the contents were lost.
viperrwk