Hello Abe. The person I deal with at the classic center is:
Thomas Hanson
Supervisor, Parts Operations
MBUSA, LLC 9 Whatney
Irvine, CA 92618-2808
Desk: 949-598-4842
Mobile: 949-910-3829
Fax: 949-598-4870
Email: thomas.hanson@mbusa.com

As for the welding, I bought a welder and taught myself to use it.
I do know of a 107SL owner who owns an auto body shop in Long Island, perhaps he can help you or recommend a good welder. He does have an account here under the user name Jjchones. Try PMing him and see if you get an answer. I don't know how active he is here, however I do know he is very active on the Benzworld forum under the same name. If you have an account with Benzworld, you can PM him there also.

http://www.benzworld.org/forums/r-c107-sl-slc-class/1502254-wood-refinish-project.html