That is a 2ohm car amp. Convert that 800watts down to 200 watts for 8 ohm and add the cost of an AC/DC converter. Getting a plate amp at
partsexpress.com would be a better way to go. I don't know if there is a diy board on this forum but that would be where you need to spend some time reading otherwise your just throwing your money away.
By the time you pay shipping and the extra costs in rigging that car amp you'd be with-in a few dollar of this respected
kit and would have a much nicer cabinet too.