I think a lot of the Saudi stuff was done at Associated Air Center at Love Field in Dallas. When you walk through their lobby they have some huge presentations on their custom work. A few DC8s, I think 757s, etc.

Some of the less opulent custom work can be found here

http://www.associatedaircenter.com/bbj.htm

Here is an AV Rack

http://www.associatedaircenter.com/avionics.htm

Note in the write up that the technicians receive training on large commercial aircraft. Now that's nice.