Maybe this will help - I have the cd holder in the top slot, and have glued a 3-outlet 12V adapter to the bottom. That gives me outlets for my xm radio, phone, and an extra cord to charge either the bt gps receiver or the bt car speaker. The xm cord is tucked in under the glove box. The antenna is just on the dash. My phone just sits in the beverage holder. It also is my gps system, and I get too much glare (with the top down) anywhere else in the car.
I think the ashtray is exactly the same size as the cd holder, so it should fit in the slot the same way.
