Finally done. I posted the patterns in the downloads section for who ever wants it. Because no two grain elevators are exactly alike, the patterns include both 45 and 90 degree elbows. The safety cage around the ladder is optional depending on the time period being modeled. I don’t know when safety cages became mandatory. I am guessing in 1971 when OHSA (US Occupational Safety and Health Administration) was established. I also don’t know what is on top of the collection bin that requires a ladder for periodic inspection. If I ever find out, I can always at it later.