Ok for fab work to the seats for the rear......NONE....They work.
As for the car about an hour and thats it. For the tops Ours have hooks that stick out on the support that holds the package tray. Paul cut them off. Then after you get the seats you'll have to cut 4 small rectangles out for the factory GTO tabs to lock in. As for the bottoms theres to hooks that will line up with two holes you'll have to drill from there you could buy some rivinuts or just get untder the car and weld a nut or just run a bolt through the hole and have someone tighten it. As for the bottoms the factory brace in our cars line up. The problem is that the clip locks in the GTO seats are wider than ours so you'll have to build some small boxes with thin steel and rivit or weld in place these will give support and give the seats comething to clip on. Our resident junkyard guy could cut them off of the GTO in his yard to make life easier but this isn't a big deal.. Done there mounted now what your left with is two voids on the sides. Which have air spaces going to the trunk will help on letting sound and air pressure out so the subs don't rupture the deck speakers. Plus 1 on this. As for the coverings a stereo shop over there that does fiberglass could do it or I can see if I can get it done here with the guy with the zapco hemi magnum I met last week. Then cover in suede to match your headliner. You could use balsa wood or the aluminum honeycomb to save weight and strenght to the fiberglass. Hook ups for electronics could be there inside storage what ever you want could be done its a good sized area and could get as elaborate as you want. Or say piss on it and just cut a piece of carpet to match and attach to a piece of heavy cardboard or aluminum that is cut to fit. Let me know what you think on this one. It really should be done after the seats are in your car so it flows and matches perfect to your installed height etc.
The package tray works fine which I was afraid of the only visual problem I see if from the rear where you see the zipper you could die the fabric or just build a panel with two arches and cover in suede. After we get every thing finalized I get a few extra yards of suede so everything can be covered and you'll have extra.
Now for space I'm six foot and I climbed in the back and had a sit down. Almost wanted a nap. Pleanty of space and are sitting at the perfect angle. /ubbthreads/images/graemlins/devil.gif
Before you ask the little pockets on the outside edges hold a plastic piece on an elastic string to a child can sit back there and route the belt through it and not rub them in the face. You'll need this in the future.
You owe me yet another steak or one of the patty's pork chops for making me pull the baby seat out. /ubbthreads/images/graemlins/grin.gif Patty's is a place about 75 miles from here in Kentucky the pork is to die for, grilled outside and the size of a porterhouse steak except 2.5 inches thick.
Enjoy Paul.