So here's the plan.

It's 14 ft x 2 ft. There is a 2ft x 2 ft town extension at the right hand end, but this is purely scenic. Four 3ft 6 in by 2ft boards, but the end of the fiddle yard will have a short single track extension to enable a run round there without excessive handling. However for cattle fairs the extension may be as long as 3ft. I'll be detailing this later.

The track is completely flat, but the illusion of the third dimension comes from the track crossing the river valley and a gentle landscape slope through the station area. More altitude can be introduced in the town.

Note: I'm assuming that this should be a thumbnail linking to the full image. If I discover there's anything different I'll edit.

Buildings and structures:

Station Building and Goods Shed adjacent the platform as indicated. Cattle loading dock opposite station building. Engine shed off loop, with watering and coaling facilities. Signal bx, the lonely little rectangle by the loop. In the station yard a mill and various warehouses. The mill may turn out a bit like the one at Dartington, and the warehouses will probably have elements of those at Totnes Quay.

River Valley:

Think a smaller version of the Dart at Buckfastleigh. The outlet mill race flows into the river near the bridge. Calm pools and small waterfalls here, the main energy of the river being generated further up in the hills, but not that far away.

Baseboard Construction:

Ply, 5.5 or 6mm. 5.5 mm seems to be more available. Framing is ply as is cross bracing. The location of those will be decided when turnout, signal and uncoupling magnet positions are determined so that they don't get in the way. There's no backscene as where buildings are cut they will show interiors.

Control:

Analogue control - I'll be building my own control units. Turnout and signal control by manual interlocked lever frame.

Layout Storage:

Because of the necessity for protection and the preservation of a little family life it will be disguised as furniture. I have thoughts, but need to draw out a full sized plan first to see if will all work.