Hey, 35WINDOW -- Good ol' Au-Ve-Co! Thanks for the link. I emailed them and asked ... and also gave them a link to this thread; we'll see if they respond!
Thanks, Brian -- I've thought about that, too. But I always think the velcro is gonna be a bit of a pain in getting the panel to sit precisely where you want it. Maybe I'm wrong ... velcro *is* a bit "spongy" if you know what I mean. I'd be concerned about the panel sitting too much OFF of the door - velcro would take up about 1/16th of an inch in thickness. Your point is well taken though ... I'd rather use velcro than panel clips!