Hi Kevin,
The Roger Carp book is great! In looking at the book, I think you may be referring to the D-264 which was a super O layout on a 5 x 9 board. I think you should be able to fit that track plan on a 4 by 8 sheet of plywood using 027 or 031 (o gauge) track. If you want to be true to the display layout look from the 1960s, you could use atlas track which looks a lot like super O and they have a 0-27 curve. (the only problem with this is that magne Traction will not work on the atlas nickel rails). The other think to keep in mind when trying to fit the other track is that super O used 12 pieces of track for a full circle, while the 0-27 uses 8 sections of track.
When I did a 8x8 dealer display layout, I modified the track plan to eliminate the need for using the trestles.
Here is a picture of my display layout:
You could consider a larger diameter track for the outer loop to run bigger engines, 0-27 will restrict what you can run.
Keep us posted on what you are planning.