Hi Joe, looks like you posted this a long time ago - I just joined the forum not to long ago. The best place to find documentation for the MTH factory showroom layout in the March 1999 edition of Classic Toy Trains. About a 7 page spread including track plan and accessory list etc... I also have thousands of pictures and some videos on it now. There is one figure 8 o-gauge on it. Standard gauge are just 2 ovals. I ended up buying the layout a few months back from a cabin fever auction.
This video is one I took and it shows the track configuration pretty well.
https://youtu.be/Si4fA_kwrOg
Thanks, Craig