Welcome to the forum -- we can always use another WWI enthusiast!!! The problem with attempting to use scale functional wire bracing is that to make it really functional you'd have to be using a gazillion functional turnbuckles on the wires. The three techiques I've see to simulate the wires on a model are 1) rigging thread 2) bamboo dowels/skewers (used on my Nieuport build) and 3) bits of wire (that's what I used on my EIII fuselage).

I'm also interested in scale fittings and I hope this thread results in some interesting ideas. Donnie (the builder of the Jenny UC you show) is certainly a master of little metal bits and bobs. Actually, I think a lot of "metal" parts can be faked with either styrene or bits of aluminum tape.

I think often all you can really do is go for the effect and try to follow your documentation photos as closely as possible. Here's a photo of the rather complex UC on my EIII which I think looks pretty darn close to the San Diego replica I was modeling. The wooden fairings are made of balsa soaked in CA for strength, primed and painted. The "straps" are just bits of FliteMetal wrapped two or three times. Short of using an entire machine shop to custom machine parts I think this is about as scale as anyone is going to get with EIII gear.