Hi Dave, I kept looking at this plan and thinking how much I like it. It seemed to me to be a good fit for the Lionel FasTrack modules. So I drew it up.
I used 4 of the "Small corner modules" which are O-36 and O-48 (in a 30 inch square module). I used 5 of the "Straight modules" (30 inch by 45 inches). Those are highlighted in green with the "connecting tracks" shown in light green. I used O-72 switches for the reversing loops. For the remainder of the module gaps you could make "triangle wedges" connected to the modules (shown in while and yellow). Two of the straight modules need a little help in the format of a 1 inch strip added (marked with an X) so the FasTrack ballast doesn't hang over the edge. It's not quite as long as yours on the long side, and it is a little wider that yours in the turns.
