Tips to install cardboard headliner?

LOL, I just took mine out today. I'm gonna search for the plastic replacement headliner unless someone makes a cardboard one.

Any tips and hints on where to get one?

I also think those clips were used to "Help" install the headliner. I would take the sail panles down for ease of instalation. I know there a little bit of a pain to take down, but I figured once all the trim is out of the way, the front and rear will go in easy enuff and the rest is cake...or as close as cake gets for car work that is.