So I’m thinking…  a 7″ touchscreen on the right side of the wheel, Mac MINI, Alpine “Factory Sound Processor” connected via serial and spdif to the computer, alpine digital amps on a 2″ raised floor in the trunk, some custom three-way 6.5″ / 4″ / 1″ components up front, and two-ways 6.5″ / 1″ in back, but I don’t know about the subs.

Alpine PXE-H650

Lilliput 7″ Touchscreen

JL / Eclipse / Alpine:

300×1 Amp
150×4 Amp

Speakers TBA

Also, there will be some heavy code involved for the touchscreen GUI.  I don’t need multitouch, but I do need sex and glitz, and the ability to not crash while picking out your albums.  There will need to be some custom electronics to interface the steering wheel to the computer, and retain control of the factory system.