Was looking at you tube video on making holes in carpet for the bolts etc. They used a heated socket, I used a heated hole punch. Goes right thru and no fraying, seals itself.
Quirey Quality Design Did make the headliner, chk with them. Did my 64. the wheel wells I covered in vinyl, and I put carpet inserts on the sides and floor.. SMS door panels, have a drink every time they miss their deadline. You might need a liver transplant.
Slightly off topic, this is a 64 Buick service car, conversion by Flxible Co. looks like it started as a wagon but is a 4dr sedan. Cheaper to start with a sedan than wagon.
One thing I added was small metal plate to the roof crossmember. On the 64 the dome light is only held in with the headliner. It now has a firmer attaching point. Do not know if others are this way.