That camp photo is AWESOME! Now that's good re-enactin' weather that I wish we could get here in VA!
My setups are probably not something that people with a lot of gear would want to copy. I don't have any wall tents or anything like that, so I usually improvise everything on the fly. I don't have enough gear to do anything beyond the "ad hoc" level, so temporary aid stations only.
My aid stations are usually of the "makeshift" variety so I use whatever materials are on hand to make them. Shelter halves, ponchos, tree limbs, foliage, tent rope, let-down rope etc. Sometimes they are nothing more than litters on the ground in a well-concealed position. When I do a PTO aid station (Army or FMF corpsman), they're usually more sparse and messy than what you see below. During night tacticals, light discipline is achieved by the old "blanket and flashlight" routine.
Here are some pics of a typical aid station that I'll construct for an event...this one in particular was a Normandy display involving 505th PIR and 325th GIR medics...this one we just popped up over a foxhole.