Background - This will be my first layout ever and I'm about to start laying roadbed. It's approximately 33' x 14.' It will have 2 levels that are connected by a long ramp and the "sea level" level will have an area where the double main line crosses over itself. Using Atlas O throughout with 072 and 081 curves for mains on sea level route. It has open grid benchwork, so entire sea level route will be "floating" approx 3" above the joists (via risers holding it all up off the joists) to allow modeling above and below sea level and also to split the inclines/declines to minimize grades.
Question - Instead of traditional cookie cutter plywood roadbed to create sub-roadbed and the incline/decline grades (which seems a little daunting) has anyone used the Woodland Scenics Subterrain foam roadbed or foam incline/decline sets? I've seen some youtube videos of people using it and it seems very easy to use and almost foolproof in terms of creating grades, etc. Would really like as many opinions on this system as possible, espcially all known pros/cons - so please post your thoughts. thanks!