I don't know of anyone in Austin, although there have to be a couple
of pit makers up there somewhere.
There is a nest of nationally known pit makers in Houston, but you
know what they are going through now with IKE. Klose is there, as
well as Pits and Spits, and Tejas Smokers. All of them have won their
fair share of awards.
Lyfe Tyme pits is a couple of hours away from Austin, in Uvalde.
http://www.lyfetyme.com/
Their pits are unbelievable, and I'd bet they would last a "lyfetyme".
Google "Texas Pits" and you will find a bunch of them, some with toll
free numbers. A lot of these guys know each other, so if you get one
on the phone they can probably direct you in the right direction.
Good luck!
Robert