Your muscles cannot get "longer" without some rather radical orthopedic surgery.

A weak man is not as happy as that same man would be if he were strong. This reality is offensive to some people who would like the intellectual or spiritual to take precedence. It is instructive to see what happens to these very people as their squat strength goes up.

You don't get big and strong from lifting weights - you get big and strong from recovering from lifting weights

The spine is best at bearing a load in an arch

You are right to be wary. There is much bullshit. Be wary of me too, because I may be wrong. Make up your own mind after you evaluate all the evidence and the logic.

Your ideal body weight as an ectomorph at 6' 0" will be 214.378 lbs. There. Happy? And if you lose or gain a pound, I will have you killed. It is important to be ideal.

I recommend against a wooden squat rack, for much the same reason that I recommend against a wooden car.