The EXACT same thought occurred to me last night:Your pictures of your curtains got me thinking. I am in the process of figuring out how to plug the holes on the sides of the headliner where I removed the two plastic styrofoam blocks.
"I've been trying to figure out what to do with these holes on the edge of the headliner.. I guess that problem just got solved!"
Great idea with the paint rollers Dave.. I've been trying to figure out what to use as a "rod". As they are now, I've just clamped them to the van. I don't think I need to add insulation to these.. they are double layered and a very thick material. They worked great at holding the heat in the cab this morning.