Excellent! I'll call you some time today.
To be honest though, this isn't a show car. It's going to be more of a daily-driver-ish thing...so I want it to be more user-friendly than audience-friendly. Waise bhi...when you're as ancient as I am, you want your music to be somewhat sedate rather than eardrum-piercing. 
Instead of an iPod Touch, the solution might very well be an iPhone, instead...which connects via bluetooth, and can be propped on the dashboard, in a nifty-looking cradle. This would provide a GPS, an onboard telephone, and an entertainment system, all-in-one. You've seen a similar arrangement which I've made for my Pickup using an iPad. Putting in a "show-stopper" arrangement of speakers and subwoofers in the trunk might LOOK very nice...but I'm NOT going to stop at busy intersections, whip open the rear lid, and blare loud music. Somewhere in this thread, I mentioned this as my "midlife crisis car". Well...it has to act the part...of belonging to someone in the "midlife" range.
I'd much rather the sound system be the 2ND invisible "Devil Inside"...like the 1UZ. Soooo...having laid out basic parameters, I leave the rest to your capable hands, and fervent imagination.
Cheers, Usman!