I think Pete's right, but also with 7mm and the length of the layout, each board/scene has the potential to be a separate stage set.As the viewer steps along the layout, each area becomes the 'central' view.
As for what to do with the wharf, if the only reason for detailing is for the very rare occasion of photography, then keep the doors shut with 'danger derelict building' signs on.
I agree Stu. If you don’t buy the cheap front row seats at the theatre, you can see the whole stage. Model railways, unless they are of the cameo style a la Iain Rice, are very difficult to survey from a single view point. Taking Gordon and Maggie Gravetts’ Pampoul as an example, it sort of fell into two distinct areas, the station, which was simplicity itself and the village street and river scene, which complemented the station. The village could have stood alone as a diorama, but it visually worked well with the station.
My own model, Kelly Bray, is long (15’6”) and thin (1’9”) and it is not possible to view it all at once. So there are several scenes, the engine shed separated by an over bridge from the station area, which falls into two area; at the rear the platform and the back siding. In the front is the long single goods road with cattle dock, traders shed and end loading dock. Each area is a separate mini scene which has its own focus point. The platform became a challenge because it had the small station building and gents loo, and it was too easy to fall in the trap of adding too much. There are only 6 figures on the platform; one porter signalman, two passengers and a family group of 3, with the adults seated and the little boy looking for the trains. Not much else going on really.