Roger
I can`t think of any shops right off the top of my head BUT, we do have a pretty good size group of Cobra owners here in the metroplex.
Why not post up in the Texas forum for some build help? Call out for the T.I.T. (Texas Installation Team)
Pizza and beer and a couple weekends will go far to helping you complete the build.
I`m currently building an Antiques and Collectibles Cobra now and I`ve had to ask for help already. And the guys came over no questions asked.
We also get together the first Saturday of every month for a lunch somewhere in the metroplex.
Keep an eye on the Texas forum for a post about that about a day or 2 before.