Very carefully. Generally take trunk pan and tail panel out and slide in from the rear. I read a post here about a year ago that someone said they got it in through the windshield frame, but I don't know how they pulled that one off. When we did the floor of my coupe, we braced and jacked level off the floor and installed from the top. Did the full trunk pan first, then did a large, partial floor. Never raised or flipped her though. It sounds nice, but tough to support and brace.
Bit of an odd ball. Rear Qtr's, trunk floor and tail pan excellent but rear inner and outer wheel wells have to be replaced.
It's a vert so no need to go thru windshield. Twisting and alignment is where I have to watch. Rockers and front firewall are strong. I will design the braces so I can remove and reattach after floor goes in I guess.
