[bojan]

Well, talking from my experience, it is always better to have separate regulator for each load (appliance) next to it.

The simplest way is to have ~240V AC to whatever DC next to appliance.
If you really want low voltage bus, then the best is to go for, say, 48VDC or AC (suitable transformers may be found, they were used for soldering irons or for power distribution in industrial environment for power tools, like electric screwdrivers and so on) or 15 VDC, and have individual SMPS's (or linear regulators, fol low power consuming appliances, like camera).
This way, you will prevent noise from spreading (from "dirty" loads such are motors or similar) to noise sensitive appliances (camera, for example).
Also, in case of fault on particular appliance, the rest of the system will still be functional.
My 2 cents..