I've built an 8-track studio in my house that's virtually identical to what they used at Abbey Road, and I also own the 16-track set-up that Led Zeppelin used to record 'Houses of the Holy.' I'm interested in producing, but I'm mostly recording my own stuff.
I destroyed a lot of guitars trying to get them to do what I wanted, but I learned something from every guitar I tore apart, and discovered even more things. Things like if the string is not straight from the bridge saddle to the nut, you're going to have friction.