Bufferstop wrote:Do you want this to be a scenic model railway, or an extended train set layout with the odd station or other building placed but not fixed down. If it's the latter you might get away with reaching the centre of the board from one side or the other, but not reaching one side from the other. You'll then need between 18" and 2' clearance on 3 of the sides unless you can crawl under to reach the far side, then you don't need a walk space on two opposing sides. You might put it on castors, big free swivelling ones like a hospital trolley has then you could push it into a corner and pull it out if you need access, any smaller wheels and you'll have steering problems (think supermarket trolley).
When it comes to what you can put on there, well any thing that will fit in 6X4 with a bit of extra width on the sides with the straight bits, but you still won't be able to make mush use of the centre other than putting in a turn table with tracks radiating off it. The Hornby turntable has the dubious advantage of being able to accommodate Hornby's largest loco so will take a big bite out of that central space. Depending on how you can position it, you may be able to extend the road opposite the entrance to take a train longer than will fit on the turntable. What else will fit depends very much on where you can fit it, the format doesn't leave much choice of where things go.
I would say it's a scenic trainset.