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Progress has been slow, but I've completed the string spider. I'm really surprised with how stable it is. Thanks to Rolf for his advise.
I did incorporate a 4mm offset, hope I got it right.
I avoid over tightening by testing the note made by each string!
I used two carbon fibre off cuts to terminate the strings. they're fixed with two bolts that run through the upper holder, that way they remain stiff. the CF provides stiffness with hardly any weight.
As rolf suggested, its possible to collimate the secondary mirror with the string adjustments alone, but I prefer to keep their tensions fixed and make minor adjustments with the 3 spring loaded central bolts.
Central brace turned out pretty strong as well. I will add two more bolts through the dovetail and wood that way both pieces are held firmly to the dovetail.
I will have to test the strength with the camera and mirror sections, but it should stay sufficiently stiff for the 6kg odd load.
I will add one more dovetail to the opposite end so it can fit in my fork mount as well.
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