It's very funny for me to stumble across this thread because I'm your height and my dad is your dad's height. Strangely, though, my shoulders are noticeably broader than my dad's, my neck is longer, head about the same size, my feet exactly the same size, my hands very very close to the same size, sitting heights the same (although my belly button is higher on my torso), and my arms 1.5 CM shorter each (strangely that 1.5 CM difference exists only in the fore arm). My 175 CM friend and I share exactly the same true inseam. My wingspan is confirmed 186 CM. I bet that if I wanted to do LL, I'd look great at 183-188 CM but no more than that. The problem would be that if I only did one segment, then the other segment would look short compared to it, and my tibiae and femurs seen quite proportional to each other to start with. Also, because of the risk to athletic ability (which I highly value) I don't know if it's personally worth it to me. But it is interesting to compare proportions. A lot of people assume that everyone naturally has the same (or similar) proportions to everyone else. Any orthopedic doctor can tell you that's a bunch BS. Even measurements of models and athletes confirm that body proportions naturally vary a lot.