Time for me to get onboard with this! Since I don't have a digital camera and have to shoot up a roll to get pics to scan I'll introduce my project with a couple of sketches. My least finished part of my layout is on a curve that has tracks on two levels. Here's an old pic of the upper level: http://www.the-gauge.com/attachment.php?attachmentid=19964&stc=1 There is hidden track immediately below the track pictured in the photo. I can access it by removing rock wall cliffs made of styrofoam covered with joint compound and a long brick retaining wall made of styrofoam (originally manufactured for christmas railroad scenes but nicely done for my purposes.) The project for me now is to scenic in front of the removeable walls in a way that hides the joints between them without getting in the way when I need to remove them.