well i would start with ripping every item out of a 2007 st, bodywork would be left stock apart from the wheel arches, they would be flaired out 3 inches on the rear and 2 inches on the front, allowing room for the following.
lamborghini v10 supercharged engine, forget the rest, they are all pooo. i would have the engine coupled up to an audi rs6 gearbox with close ratio 9 speed paddle shift gears.
i would then run 80% of the power to the rear wheels using a quafe lockable diff, and 20% to the front (4x4)
there would be 8 pot calipers all round for the brakes ceramic
lambo shocks
one off split rim magnesium alloy 18" alloys with 295 30 18 tyres front and 315 30 18 on the rear
full lambo dash with front seats and trim, launch control buttons on the shift levers, water spray button on the accelerator for the intercoolers, hydraulic rear spoiler that comes up out of the bootlid.
loads of other bits as i went allong
that would be my usable cut and shut car, my unpredictable one would be the above but with full veyron running gear, engine ect ect