I'm looking at building a variation the GS&S in On30. I have 3 pieces of 1/2 inch thick plywood measuring roughly 18 inches by 4 feet. These I thought would make the surfaces of three sections/ modules. The main concern is my current motive power consists of two Bachmann On30 2-6-0 Moguls. I have 1 passenger consist of 1 combine and 2 coaches and my freight cars are 2 18 foot flat cars, a box car and 3 wood side dump ore cars. The idea was originally to make a 4 x 8, but now that's changed due to moving into an older 1 bedroom apartment. I have room for a shelf layout.
The railroad in concept is a narrow gauge route running from the Kansas River/ Kaw River in Shawnee County, Kansas to coal mines in Osage County, Kansas. The terrain in between is a mixture of flood Plains and wooded rolling hills with a steep bluff on the south shore of the Wakarusa River which runs through southern Shawnee County just above Osage County. The switchback of the GS&S could represent a similar switchback to climb that bluff.
It's interesting that in O scale the 5 or 6 inches for the upper station of the GS&S would almost be the right elevation once the scale feet are considered. The bluff is vertically 20 or more feet above the level of the Wakarusa River's flood plain.
My road name is the Kansas River and Southern. I am very loosely basing this road on the real Kansas Central Railway/ Kansas Central Railroad/ Leavenworth, Kansas and Western that was 3 foot gauge until 1891 running from Leavenworth, Kansas on the Missouri River to Miltonvale in North Central Kansas.
The biggest difference is that the KR&S runs southerly from the fictional river port of Meek, Kansas (named for Dave Meek of the Thunder Mesa Mining Company and Thunder Mesa Studio) to the fictional coal mining town of Underwood, Kansas (named for Brent Underwood who owns the ghost town of Cerro Gordo, California and has the Ghost Town Living channels on YouTube and Patreon.)
When I was going to build the 4 x 8 there was a spur to a riverboat landing. Now that is going to be off layout as will be the town of Meek. Now I may have the farm town of Richland, Kansas represented besides Underwood. On another shelf plan in an L shape I represented Richland with a Wye for turning my locomotives.