I never really understood how these desks were "frugal". I looked into doing something similar in early 2005 after hearing stories about these, but solid-core doors were more expensive than the other options. I ended up buying two two-drawer filing cabinets (because I needed storage space anyway), running two 2x4s between them, and laying two 2'x4' sheets of MDF on top. All the parts, including the filing cabinets, cost less than a solid-core door alone.