Try
www.onlinemetals.com for aluminum. Aerospace composites or CST might be good composite places to check out. Put a post in the composites forum of RCU. There are some knowledgeable guys who can point out where to get the correct materials.
I'll see what I can dig up for any photos of servo linkages, etc.
Good luck on the rebuild.... Let us know how it progresses. photos???
Michael