You will find such a project a fun and rewarding experience---if you choose top-notch experienced craftsmen. Start out with a sound quality gun with good barrels for the basis and have a definite plan. Your project will go smoother and end up exceeding your expectations if you and your chosen craftsmen communicate well together as a team. Be patient. Good luck!
Here's a link to my 20-ga. Fox Sterlingworth project that was completed last year:
http://www.foxcollectors.com/My%20Forum/phpBB3/viewtopic.php?f=9&t=1057 
