Luckily I had enough chunks to complete the 
image. Some edges are missing though :\

What I did was glue the pieces onto a sheet of 
acid free paper, sort of like a jigsaw puzzle. If 
you get a acid free paste stick (they have 'em at 
Wal-Mart), the glue shouldn't show through the 
paper or turn the paper any yellower than it 
already is. Oh, and don't forget to put a sheet 
of wax paper over the reconstructed drawing and a 
heavy book on top. It'll curl as it dries if you 
don't. 

Ja!
KF