Complete car system?

I have an entreprenuership competition im entering with a friend and im going to make a whole car audio system in a small area.

Im going to make a kind of center console and put a deck in it and have 4 speakers in 4 corners with a sub, and the sub I plan on making a box out of mdf for all of the sides except for the top will be plexiglass and im going to put mirrors on the inside of the mdf and carpet on the rest of the outside, with maybe some neons on the inside just for looks because part of it is judged on display.

I need to know how to power my sub amp and my deck off of 120v? are there 120v to 12v converters I can just get?