Difficulties Installing ABS Headliner in 73 Swinger

I got my greased football, (I've been calling it the dish rag, as in limp as a dish rag), up but it needs trimming on the front and back. I'm pulling it tomorrow back out, laying the factory one out, laying this one over top, getting some tape and taping it down to the old one through the holes, make some marks and trim some of it up. Not many interior shops wanted to even touch it or they want to pull the glass out and right now if it comes out old it's new going back in if I can help it and I'm not ready for new glass. I'll try posting results or how it worked out.

Side question, anyone have to trim/cut the coat hanger brackets out for a flush fit?