Due to needing to avoid having anything permanently fixed to the walls, I have built a "J-shaped" free standing workbench in there which gives me plenty of storage space. There is a chimney breast in the middle of one of the walls hence the need for the J-shape. Anyway, this gives me a suitable worktop of roughly 8ft by 7ft which I can place portable baseboards on top of to work on and run the layout. These can then be stored on the shelves underneath when I need the workbench for other jobs.
After many months of planning and tweaking, I now have a workable trackplan to build my layout from:

This will be a fictional GWR Terminus in 00 Gauge set in the West Midlands region during the inter-war period and includes a goods yard and a small MPD with a coaling stage (and a hopefully working automaton of the coaling tub.) Space in the room allows for a non scenic traversing fiddle yard to be put in which I can either leave trains out on or store away if needed.
For historical links, the name Stourford is an amalgamation of the towns of Kingswinford and Stourbridge which I live in between and these were in the old GWR territory which included what was the Oxford, Worcester and Wolverhampton Railway (later the West Midlands Railway and merged into the GWR) and the Kingswinford Railway (later extended to Oxley, Wolverhampton via the Wombourne Branchline and also connected to the Earl of Dudley's Pensnett Railway). Kingswinford also had the Shutt End Railway (which eventually became part of the Pensnett Railway system) that was built in the late 1820s to transport coal from the Pensnett Area to Ashwood Basin which happens to be 5 mins away from my house. The engine that orignally worked this line was the Agenoria (sister engine to the "Stourbridge Lion" for those who may have heard of it) which has been preserved and you can see it at the NRM in York.
As I'm setting this in a fictionalised area within the Black Country area, I can base rolling stock on those rostered at Stourbridge and Oxley sheds and potenially Kidderminster too for the odd excersion from the Severn Valley Line. So looking at various Pannier Tanks, 14xx's, Large and Small Prairies, Halls, Granges, possibly Manors as the nearest ones in the area at the time would have been based at Shrewsbury, Moguls and Collet Goods. So nice wide variety of stock.
So far the baseboards have been constructed, cork underlay sheets have been purchased and track is slowly being acquired. Have been collecting various bits and pieces of buildings, trackside scenery and electrics during from visits to various model railway exhibitions so have got plenty to work with.
Pictures will follow once I make a start on laying the track.