Originally Posted by jonathono2000
Oh I'm way overthinking it for sure.
You're really not over thinking it. Best to think ahead and as you suggest perhaps experiment.
The further the yokes are apart the greater the likely torsional(structural) rigidity of the NRS frame. Imagine the extremes. First, imagine the yokes next to each other at the center of the frame(boat), then............. I motored a six mile open water crossing between Baja LA Bay and Guardian Angel Island in a frame that lacked sufficient torsional rigidity. In continuous up to 8 foot swells it got kinda scary. I firmed up that frame first thing after getting home.
Earlier I mentioned tube material. Properly inflated, a PVC cat tube is more rigid than a hypalon tube. I think you'd better be able to get away with moving the yokes inboard with a PVC tube.
For a cat, I personally prefer the rigidity/integrity of bent and swedged corners and drop rails for bigger water. Or a properly welded frame. (Not, to suggest that a NRS frame is not up to the task. We know they are.)