Do you classify CFS Strathalbyn's new HQ, CFS Morphett Vale, CFS Port Elliot/SES South Coast and CFS/SES Kingston SE has sheds ? Personally I thought a shed was like a large agriculture or slightly bigger than a two car garage.
Having completed some training at the Port Elliot building, I think they make a good model because they combine all of the required facilities. But it is built from metal.
I think the environment where the building is built should be considered rather than just what the building looks like. For example, I believe you should get better facilities to protect volunteers from the heat, cold and rain. If this means airconditioning in crew relief areas, so be it.
This is in addition to the basics of a toilet, crew change space, crew lockers, meeting/training/ops/welfare room, enough space for all equipment, etc, etc.
In regards to 'emergency wig-wags' I personally think the idea of traffic light control would be better. I understand CFS Seaford have this on the Commercial Rd / Seaford Rd intersection.