Roof rack with high top??

Hey folks, my local junkyard has one of those fiberglass high top roofs on an Astro and I'm tempted to pick it up and use it on my camper van build (2000 Astro cargo). I would like to have a roof rack though, which would not be possible the way most roof racks are attached... on top of the roof itself. My question is, has anyone added a roof rack over a high top, via some sort of side mount? That is the roof rack is attached to the van along the vertical reinforcements alone the sides of the van instead of the roof?