Oasis is right, splits are hard to find and expensive when you do. I have a friend that has two splits, two zwitters, and three ovals. ('47, '51, '52, '53, '55, '56, and a '57) I would like to build a GermanLook Split myself. I would just love to see the look on the purist faces when I come pulling in to a show.
That said, I believe it's easier to make a cal-look or resto-custom with a spit, because sometimes it's hard to find good original parts, unless you pay an arm and a leg.