I love the helpful attitudes evident here; you're all enablers, aren't you?!? :-)

Marcel, I haven't built a 12 but I do own an 80s Jap-built electric solid body 12, and it is seriously epic, if horrendously neck heavy! A good quality 3" strap puts paid to most of the headstock diving!!

A small wrinkle that I have done on mine is to change the octave string tuner buttons to something different; in my case tulip buttons, to make tuning much, much easier! This isn't a problem on Rick 360/12ss and the like, but I found alternating tuner buttons ever so helpful....