The general 'plan' of the preserved depot, from left to right, is two carriage sidings (each long enough for 6-7 coaches, a water/coal/depot crane road, two lines to a loco workshop / shed, and the turntable, allowing stock to 'pose' (some of these roads (if not all) will have sheds over them too.)
The big space in the corner can house a town scene and I'm contemplating adding a 5 foot curved platform from the lower curved point back to the mainline, so the DMU fleet can drop off day-trippers...