Hastings "Feed & Seed" squiggle style

In the same folder with the alleged Marmora station, I found this single-sheeter of the Hastings "Feed and Seed" I posted photos of back in 2011. This youthful drawing from the '70s is much cruder than the Marmora station. The proportions are all wrong, but maybe I selectively compressed it :-) Regardless, on the drawing's flip-side I scribbled a lot of calculations - maybe I was trying to figure out how to make a small, buildable model out of this prototype.