I'd love to build my own guitar. I think there is something special about knowing what you're playing is a once off, not some batch roled off in the factor. More importantly, the fact you put so many workhours into it probably only means you appreciate and enjoy playing it more.
If you were to design your own guitar though, would you base it exactly on a current style, (strat, tele, SG, etc.), losely on a current style with your own variations, or just intevent something totally off the wall. I'd like to design something totally off the the wall, but I think I'd probably have to tip the hat alittle towards Ibanez JS or JEM models. As well as PRS, they're beautiful guitars, aren't they?