I'm no expert, but the string spacing would be very tight, and you would probably have a hard time finding a bridge with spacing close enough to fit all five strings over the neck.
Why not build a neck? If you're not comfortable building one, Warmoth has a ready-to-go 5 string neck here:
http://www.warmoth.com/Showcase/Show...=Neck&i=d5n394
They have it for $248.
Also, try looking around pawn shops/CL for a cheap five-er you can take the neck off of.