I'm pretty sure ANT Bike Mike has some kind of lesson deal going. For just under three grand he'll take you through the steps of building your own bike. Not really a full on apprenticeship, more like a week long crash course from the sounds of it, but probably worth looking into. You can check it out here: http://antbikemike.wordpress.com/br-3/

Not sure if that's what you were looking for, and it will cost you a little money, but you'll come out of it having made a bike and you have a new bike for yourself. I'm starting to get the itch for building myself and need to get on learning how to braze and weld, good luck!