Rich
The program is 3rdPlanIt.
Dave
I'm just a dude with a bad back having a lot of fun with model trains, and finally building a layout!
I don't think I would bother with a classification yard in only 12 feet.Each body track reduces in lenght by 2 feet (#6 switches) so tracks get short quickly.
I constructed my yard on a curve which is not ideal but that is what I had to work with. Each body track is the same length which is excellent. I don't have an A/D track as such as trains can enter and leave any body track. However one track is arranged so that it can access the main without fouling the yard lead so that is sort of an A/D track.
Bill