welcome aboard and sounds like you have a fun project ahead of you. i've always liked the delisle and have wanted to build something similar for some time now.
these guys have some of the nicer re-pro's and alot of good info through out the site.
http://www.specialinterestarms.com/index.php?page=delisle
are you after the concept or replica? reason I ask is you could likely make a simpler more effective suppressor these days. doing the offset bore suppressor is going to complicate things greatly and with the laws ever changing having the ability to replace "wipes" may become challenging in the future.