In another thread, I posted about how the Takamine acoustic guitar I bought off Musician's Friend scratch-and-dent for $35 (broken headstock) and repaired recently took a dive, delivering a fatal blow to the neck. The body is OK, but the neck broke at the nut and it wasn't a clean break either. Wanting to recycle all that I could, I managed to salvage the broken neck and use it for this project:
A Cigar Box Mandolin.
I happened to have a cigar box laying around from an old cigar box guitar project that I scrapped and reused the broken neck by shortening it, cutting and planing a new scarf joint, and gluing the headstock back on. In order to reuse the old headstock, I had to flip it upside down so the back is now the front. Sorry in advance for the poor quality cell phone photos.
I cut and glued in a neck heel block from some pine I had laying around from a previous furniture project.
Teej's 4-String Double-Coursed Alto Bass (or "Let's Build a Cigar Box Mandolin!") 
Had a heck of a time getting the top of the neck and the bottom of the fingerboard perfectly flat. The rosewood I used for the FB was slightly cupped and without a planner or thickness sander, I resorted to taping sandpaper on a flat surface and running the rosewood across it until I sanded out that cupping. And no, I don't think I have too many clamps. You can NEVER have too many clamps! 
