My ISL will be 10ft x 1ft in H0, it has a staging track of around 4ft, a loop/passing track to hold 3 x 50ft cars, with a lead/headshunt that holds a 50ft car & loco, & 3 spurs/sidings, using a 'diamond' to give greater usable length (one is 2ft, another is 3ft, & the 3rd approx 5ft).
On this layout I will use flats or very low relief buildings for the 'spots'. I intend to set the baseboard height at around about 45", & use hand uncoupling of Kadee type couplers.
(In 0 gauge I would only have got a small 'ProtoNook' in the space, but I wanted more interesting switching.)