Ned,
We integrated one in to my chassis/body on my 69 camaro. I drew up some rough pics and sent it over to Mike Riggs he ran with it while preparing my sheet metal body . He had so many pics up on his website but took them all down. Im looking at this one pic of the car with no rear quarter on it and said to myself, how cool would it be to add a solid 1 inch bar from the b pillar to the end of the quarter where the striker is bolted in all reinforces with 1/8" plate and a 1/4" tab welded to the bar to protrude out a slot in the top beauty reveal. A couple of cletes in the trunk and the bar has storage as well. Its not for everyone but my logic is, Im not going through the windshield in the event of a front end collision and dont want a 3 point harness. Should hold you in the seat firmly during vigorous driving excursions. I wish I had the pics when Mike had the quarter open, here's one that gives you an idea. If you look closely at the right corner of the pic you can see the bar going to the b pillar, clears all the quarter window hardware nicely.
Rich