This is a great undertaking and important addition to the education of high school students.  Bravo!
Having taught in high school for four years many years ago, I believe an entire senior year could revolve around building a house.  It's a plus for students and community alike and a great way to make education real while applying  math and science, arts and design, English, woodshop, and team work.  What a great addition to the high school curriculum.