Well here is the final product. You can see imperfections where I did not work the glue repair enough but I was able to go back later with a heat gun and reduce it more.
I did mine in two piece cause I didn't want to spend more time sourcing the right size in this material so I have a seem towards the back of the liner but it works out for me because I will be customizing that area as well as the area that goes across the roof where the dome light is. It's not a hard job but it can get frustrating if you don't know what is happening and why, so it pays to prep well, have all supplies on hand and take your time.