James,
I've been planning to do that for awhile now. I have an old recurve that my grandpa made that I broke one of the limbs on. It's not super fancy, but has sentimental value. Glad to see someone else who has done it successfully.
Jonathan,
If I understand it right, you want to take a one-piece bow and salvage the riser to make a 3-piece takedown? I don't have a lot of experience messing around with takedown designs, but they all seem to have beefier risers in the bolt area than a one-piece riser. It would be tough to safely modify that riser to accept pre-made limbs.