First of all scale is scale and I do the best I can but the undersurface of the top wing is sort of no mans land if you're not competing (that's a whole other case) and wont be judged on every little thing. The turnbuckles are generally ( I said generally) are on the lower ends of the wires,ie the inside ends of flying wires and the outer ends of landing wires. For landing wires I fix the Top (inner) end of the wire to an eyelet that the cabane screws go through during assembly. Landing wires are as a rule (I said as a rule) a single cable or RAF style wire and the turnbuckle is fixed to the bracket at the interplane strut with as scale looking a mounting as possible parts from steel or brass having to be made in many cases, if you cant make it pure scale then make it plausible so it looks like it might have been done that way, once again if you're not competing 99and44 100ths of a percent of the people looking at your model wont know the difference. Don I know you're different and it has to be perfect even for you so you will have to suffer through whatever it takes, for the rest of us ease of assembly is really rather important. The flying wires are often dual cables or RAF wires and attach in a scale looking (plausible) manner at the lower inside end and they attach to the wing via a tab that the wires are fixed to and a single bolt through said tab into a hard point in the wind that's threaded hardwood or a ply plate with a blind nut, whatever you care to do . I hade many done this way and I'm sorry I cant put up any pix but all my models are in Tennessee and I'm in Texas hoping to be in Tennessee by Sunday for good. There are pix and blow by blow coverage on my build thread on RCSB in the BUSA forum a thread titled !/3 Scale Nieuport 28 DOC don't be overwhelmed by the number of pages the flying and landing wires are covered I'm sure in the first 30 pages There are a couple other N28 threads there that are prolly helpful one by Shelstrm and one from Whit