This is ultimately what I'm working towards... maybe not exactly, but using this plan as a guide.
My layout measures 18 x 10 ft, so I have a little more room to play with compared to this plan.

The layout is permanent, but i decided to build the baseboards in sections so if I need/want to move it, I can do so relatively easily.
Each board is made up of 18mm MDF on a 2x1 baton frame.

12 boards make up the lower level, joined using split-pin hinges and a large bolt securing them together. This forms a rock solid base elevated on wooden legs with adjustable feet.

Boards have been coated with dark grey primer.

Being a loft layout it has it's pros and cons... I can only really work on it during the day as once the kids are in bed I can't go knocking about above their heads. This has meant that to get to this stage has taken quite a while, what with work an' all.

Deciding on the size of the layout
The dimensions of the workable space in the loft measures almost exactly 18 x 10ft, plus a couple of centimetres, so i figured if I measured precisely it would fit like a glove.