landscaping and a long pedestrian viaduct spanning the I-610 freeway, the first privately owned, publicly accessible span over a federal highway. Lloyd, Morgan & Jones designed the bridge. Additional design work for the park was performed by I. A. Naman & Associates (air conditioning); Lockwood, Andrews & Newnam (electrical); Walter P Moore (structural); Turner, Collie & Braden (civil engineering); and Linesch & Reynolds (landscape architects). of fill was required for the site, because of its low elevation and drainage issues. Dozier Specialty, who had previously worked on Colt Stadium, was the general contractor. The name AstroWorld was selected following Houston's designation as the home of the Johnson Space Center in 1965, paying homage to the nation's crewed space programs. Executives commissioned Ed Henderson, a Disney animator, to build a scale replica of the park and design maps for park guests. Henderson's model of AstroWorld, measuring , was built as a publicity preview of the park in 1967. Architecture students at Rice University and the University of Houston sculpted many of the buildings. It was displayed in the window of Foley's, a downtown department store, then moved to Hofheinz's Astrodome suite once the park opened; as an Easter egg, a model of Hofheinz's black Cadillac is parked in a private lot in the northwest corner of the park's model. After the park closed in 2005, the model was discovered sawed into six pieces in a warehouse, then returned to Henderson. He stored it in his garage before it was displayed in fall 2010 at the Optical Project gallery, operated by artists Bill Davenport and Francesca Fuchs. In 2011, it was sold to I. A. Naman and Associates, the same firm that had designed the park's outdoor air conditioning; they donated the model to the Houston Public Library. Hofheinz family The Hofheinz family, Roy and his three children (Roy Jr., Fred, and Dene), shared ownership of the park. Hofheinz hosted a press preview in May 1968; Leonard Traube wrote the park "has a beautifully realized continuity and layout calculated to move traffic in such a way as to make practical the policy of a single gate admission for virtually everything on the grounds", referring to the Duell loop that routes visitors through each part of the park. AstroWorld opened on June 1, 1968, just south of the Astrodome, creating a multi-facility entertainment complex; 50,000 guests visited the park during the first weekend.