Here's a shot of the 4 AC vents before I was finished trimming everything out. There is so much air flow out of the front facing ones you can feel it on the back of your neck while driving. Lady Shadetree reports the rear couch has good airflow from the down facing vents. Of course, we haven't lived through a summer yet with it, so we'll see.
Because I removed all the original door/wall panels to build my own, the heat ducts along the floor were gone too. I re-plumbed them into these two outlets in front of the heater, over the wheel wells. The wheel wells were boxed to add cup holders, 110V and 12V outlets.
I have a custom cot that fits between the two front swivel seats when we have a guest (our grand daughter) so I didn't find a need for an upper bed.