Dave,
I don't believe you're missing a part, GS has not developed proper OH doors.
While I've just loaded AC16, previous versions of AC, v12 thru v14 did not have a properly configured OH doors. These doors actually fit within the door opening, not covering the opening as standard for OH lift or roll-up doors.
In v15, GS introduced a track system that was what one would see in a standard residential garage door and still sat inside the wall opening. For commercial applications this simply was not functional. Your photos of overhead doors have hi-lift tracks which are quite common in my work but I've not been able to find or configure the right parametric settings for it. Again, I don't believe GS has developed those types of tracks...
Regarding Jared's comment, to model it... that is doable but IMHO the overhead doors within AC should include parametric door tools that replicate real-world situations... Maybe it's in v16 and I'll soon find out.
Dave Olufs
Just 4 Measure, Ltd
iMac Pro 3.2GHz Quad, 32GB, OSX 10.13.6, AC-5, 6, 6.5, 7, stopped for a few years--started again with 12 thru 17, 18 or 19 didn't work, then 20, 21, now skipped to 23. Started in 1976 hand-drafting ink on mylar...