Hi Mark,
I also like your work so far especially the different swirls and the seat cushion

I follow all the 5 (I think) Fokker E type builds that are under construction at the moment, enjoying the good work you all do and shamelessly stealing ideas for my build

I am working on exactly the same element of the undercarriage rigging at the moment and studied the pictures very carefully, so I would like to share my opinion with you and the rest of the guys here, as you know the truth is born in the discussion!
My understanding for the rigging and the turnbuckles is that there were only one turnbuckle per cable. Its purpose is to tighten the line and generally it is located where the mechanic can easily access it unless there is some other equirement for its location. Regularly on every end of the cable there is a loop and something like stainless "belt"(don't know the english word for this part) that pins the loop. This is my understanding it is based on observations more than on anything else so it can be totally wrong, I'm not a tech guy or a tinker.
So the purpose of this long interlude is because I think there are no turnbuckles where you put them. Check your own pic, that I shamelessly downloaded and put some arrows on it. The red ones mean that there is no turnbuckle and the green ones show where the turnbuckles is located! Don't take my words for being true, just study the pictures and decide if tehre are, or there aren't turnbuckles and act accordingly

Best regards,
Sasho
