I have made some modifications to my planned layout.  See the image below.  I have simplified the design and added a signal box.  Construction has commenced with Tasmanian Oak beams and plywood base.  The controller will be a Morley Controllers Vector Zero Two (rapidly becoming my favourite controller).

1200 x 400 mm N Gauge Layout MkII

Edit:  See below for a slightly modified “MkIII” design.  This is the design I have commenced construction on.

1200 x 400 mm N Gauge Layout MkIII