RE: SR Eindecker
A couple words on scale detail. First the metal cowling on the eindecker did NOT have those uniform rows of machine turned swirls that you see on most models (and that so awe people at the field). If fact, Sopwith seems to have been the only manufacturer who did this. The German scrolling is much more random and looks more like squiggles (or Arabic) than circles. It'd be a shame to expend all that effort to so that patterns machine swirls only to end up with something that is non-scale. To do the scrolling I borrowed an electric eraser -- and practices on some Dollar Store aluminum pots until I got the look I was after.
On the turnbuckles, I found some much cheaper ones from a wooden boat hobby shop in Canada somewhere (about $3.50 a pair). I think I ended up using at least 8 of them. Since I found myself pressed for time at the end of my build though I gave up on scale attachment points on the wings and just went for black metal clevises and thsoe DuBro 2-56 threaded couplers attached to small eye-screws.