Hi Oskar, What do plan on building? With space being limited, an 8' bench seems a little large. If you could get by with a 6' bench, it would give you more options.

One thing that would help with storage is a shelf on the work bench.

Moving the bench away from the wall won't make your work any easier. It will be difficult to plane if you move the bench away from the wall. You were thinking of a 2' wide bench, leaving you 3' of space. If you 1 foot from the wall, leaving you 2 feet of space to stand an move. A narrower bench will help, If that would suit the work you are looking to do. Have you considered a Moravian Workbench? It has a narrow top with a tool shelf in back. This would allow you to traverse while planing, without moving the bench away from the wall. The shelf will also help with a little bit of storage with smaller tools.