SANTA CLARITA – Prefab buildings, portable classrooms and even a smaller campus are now on the drawing board as the Hart school board weighs how to cut the price tag of the $175 million Castaic High School. Three designs were introduced Wednesday night as the board opened discussions on how to tighten the budget for the long-awaited project. The original proposal for a deluxe campus – as well as plans for performing-arts centers at Saugus and Canyon high schools – were put on hold to fund renovations at aging Hart High. “This plan will bring Castaic High School into alignment with the Hart district model program,” said Rob Gapper, chief operations officer for the Hart Union High School District. The three proposed designs, presented by Fred Sweeney of PMSM architects, reduced the Castaic campus from 2,600 to 2,200 students and incorporated a two-story modular building and portable classrooms into the plan. The school had been scheduled to open in 2010, but delays in getting permits for the NorthLake project, whose developer donated the school site, likely will push back the high school project, as well. Parent advocate Flo Lawrence of Castaic said the Hart board should be more concerned about getting the school built than its design, and she encouraged members to choose another site. “For them to be redrawing these plans and taking out things before they know where the high school is going to be is lunacy,” Lawrence said. email@example.com (661) 257-5254160Want local news?Sign up for the Localist and stay informed Something went wrong. Please try again.subscribeCongratulations! You’re all set! Reducing the capacity on the existing 61-acre campus site cut the cost of the project by $25 million. Cutting the project to 42acres – about the size of the relatively new West Ranch and Golden Valley high schools – cut $3 million more. The third option used 30 modular classrooms and 35 portables on a 42-acre site at a cost of $124 million. But the presentations lacked the innovative modular buildings and alternative construction methods that the board had discussed at past meetings. “I was disappointed when I saw portables,” board member Gloria Mercado-Fortine said. “They missed the mark.” Paul Rivas, the district’s director of modernization projects, said schools statewide are using prefabricated buildings to cut costs. He added an entire campus made of modular or prefabricated buildings could be built for as little as $100 million.