Nope, this was built entirely from scratch. One of the zoo's board members--of the famous Bass family--kept pouring money into the project to make it bigger and more "edutainment"-oriented. She also largely bankrolled the MOLA project.
Wow, I stand corrected. I was basing this off of Allan Nyhuis's 1994 zoo guidebook where it refers to a Texas Town at Fort Worth. I just assumed they used what was there when they built Texas Wild! Thanks for the info reduakari.