do research, learn about enclosures a bit, then try building one. reminds me of a box i saw on craigslist that was labled "ported" because the terminal was missing. I would also stop looking for good deals on ebay for sony car audio...
Most of us were bashed or embarrassed with our first builds or setups. You learn from the mistakes and listen to people that have been doing this for years and you will be good to go