If the neck bar was tapered you might be able to have some cams that changed the spacing of the frets so that the intervals worked anywhere on the neck. It would be an interesting set calculations and need a cunning mechanism.
Jeff, I bitched about your magic trick video and you want to friend me? Okay. Don't know if you want to blast me in private or what.... I have looked at your page and you seem like a cool CBG guy - and good with magic. Part of my complaint was due to people putting up a cbg video and then other folks putting up non-cbg stuff and soon knocking it off the main page. I am a crabby old turd (some times). Good wishes and happy Ground hog day.
No need to appologize about time. I remember a time when I had only one life. Now a days with the internet, we all have a second virtual life too. I just hope technology does not come up with a third life, like avatars or clones, anytime soon! LOL Enjoy.