Mathjew or is it Mathew, I have to tell you, that is a BIG, BIG job with little payback. I have no idea on how it would be done on your Sunfire. I would have to study it for quite some time before I touched it with a wrench.
If you, youself, can't walk up to that car and figure it out, please don't let someone talk you into this. There are lots of people who talk about modifications such as this like it is easy. IT IS NOT EASY!
This along with suicide doors are HUGE project requiring a good understanding of geomotry and mechanical engineering. You don't need formal training in these fields, but you better have a good working knowledge of them! These modifications are NOT JUST cutting and welding some stuff together, they are VERY COMPLEX projects. If you get someone telling they are not, DO NOT BELIEVE THEM!!!
I have see a lot of cars butchered up with these modifications. Ones that the doors, hood or trunk don't work worth a crap. They hit the adjacent panel as they open, they fall to one side as they open, they just work like CRAP.
I have done them, a few times, THEY ARE NOT EASY. They take many, many hours to design, BEFORE you touch it with a wrench.
There are many halfars web sites and stores selling "universal" kits to do these jobs, THEY ARE NOT TO BE BELIEVED they are a joke, and there is NO SUCH THING as a "univesal" kit. I guess the word is pretty relevent, "Universal", by their standards would be a pile of wood is a "universal" kit for a house! Sure, you wouldn't be lieing right? You could build a house out of the pile of wood, but it would take a talented person to pull it off. These "kits" are like a pile of metal, sure but if you were good enough to pull it off you wouldn't need to pay for the "kit" you would just go get the metal and do it.
There is NO SUCH THING as a "universal" hinge or kit for these modifications. Each and every car would need a COMPLETELY different design, each and every car would be COMPLETELY different, there is NO ONE "KIT" THAT COULD PROVIDE WHAT YOU NEED.
Listen, just spend the time you would on this modification on DETAIL, that is what makes the difference on a show winning car. Do something that you don't have to be parked with the trunk open for people to see. Besides, there is NOTHING uglier than a car parked with the trunk open! I don't care which way it is opening, I don't care how "cool" it may be that it opens "wrong", it is UGLY.