Canopy Headliner: Replacing the canopy headliner is quite easy.  I recommend it when the canopy windows are replaced.  It's also a good time to replace cracked or broken plastic.  I don't have pics of the initial stripping of the headliner. I never install the center piece of plastic.  Not only does it look cheap, it is cheap. I trim the corners on the canopy plastic. I use an automotive trim bead in place of the glued on bumpers. This trim has a metal core that piches on the metal lip and captures the headliner material.

Look closely at the 4th picture.  This is how I finish off the front. This headliner looks professional.