What is the best feature of your favorite car?

[Julioluko]

I'm designing and making an interior of car for friend of mine who is in the process of making an ultralight, he is an engineer for GM and thus has chosen his power train, suspension, and frame. I am making the interior for the car and am going through some designs and features of cars that would be good to include, and since I have a blank canvass to work with I've been going through what features I liked in cars that I've driven. I'm looking for some good designs and features and here is what I got:

~Oscillating interior vents: 88' Mazda MX-6 & 626
~Pushbutton start: BMW Z8
~Gauge Cluster: 94' Chevy Camaro/Firebird (have to to match transmission/engine)
~Auto tinting rear view mirror: 86' Pontiac Firebird
~110 power outlet (like in Pontiac Vibe) but will use an after market.
~Interior dash& counsel from a 94-95 Mazda MX-3.

Can you think of any other interiors that are really ergonomically designed or some neat features, like good cup holders, that I could include in it?

[coled91]

how about some cupholders like my 95 altima... jk lol you def dont want those