[Unobtanium-inc]

With an initial investment of only $500, you could make it a long term project, collecting parts and such as you need them, and paying as little as possible. That said, everything for an early Porsche will be somewhat expensive. A decent dash will run you $500-700, for example. If you look around, you can probably find somebody who will sell you a more complete car for $2000-3000, and have lots less ground to make up in terms of buying parts. I disagree with the above estimate of $15,000 unless you plan to buy only the nicest parts. If you go with a VW engine for now, and are ok buying marginal parts that need some attention or are cosmetically challenged, you could easily keep it under $10,000, IF you do all your work.