This page has links to restoration project galleries that have been placed on the web:
Aerocraftsman rebuild of Bureau 4477 (N44848) here:
http://www.aerocraftsman.com/gallery/?album=8&gallery=10
Here is the Centennial rebuild of Bureau 2892 (N120BH) for the Fighter Factory:
http://centennialair.com/N3N.html
The Saunders rebuild of Bureau 2986 (N45131) here:
http://www.sandersaircraft.com/restoration_n3n-sanders.asp
The Bill Hirzel rebuild of Bureau 2003(N582WH) here:
http://www.navyn3npartsrestore.com/PhotoAlbumsPro/Album_mkp19l/#/0
Here is the work that the Iowa Aviation Heritage Museum is doing on 4494 (N45120) :
http://iowaaviationheritagemuseum.webs.com/apps/photos/album?albumid=1110219