It's a set table my set up is in garage with one edge against wall so that's where this would be placed so won't effect play. What I was think was a railway track station with a retaining wall behind wall a row of low relief buildings if that makes sense so that non playable part would be just a background piece amend something like 10cm deep everything below retaining wall is 28mm and playable. Waiting on my first 1/43 scale car to be delivered a morris minor van