The backdrop will be a view up Kootenay Lake. From the station, the mainline circles up and around Kaslo Bay, behind the Buchanan sawmill, to a switchback and the Kaslo Yard at top. From the yard, the line winds and climbs towards Sandon. While most of the track arrangements are authentic and to scale, a few compromises were necessary for the model, including shortening the sampler spur, shifting the sawmill to the left to improve access to the yard, and shortening the storage spur to accomodate the overall change of shape. The loop behind the storage spur is quite tight, but is partly hidden by the 'A' Avenue trestle to Upper Kaslo and the hillside.
Narrow gauge refers to the distance between the rails.
Nn3 is very very small, especially when you compare it to the HO scale I'm more used to. Nn3 generally uses Marklin Z scale locomotive mechanisms, with bodies that are either scratchbuilt or made from commercial conversion kits. The precision and reliability of the Marklin mechanisms makes for good operation. As with most research efforts, a few mysteries remain. Not really important things, but nagging ones if you're building a model, especially when the mystery is right up front and centre.