Looking forward to seeing what sort of options you go with. I am working on a 78 280z but its the 2+2 model. I am pretty much at the same point you are. I still haven't planned what all is going into the z cause I am trying to get alot of the rust removed. I've got everything interior-wise removed exept the dash. I've got the floor pans removed and plan on welding in the frame rails from www.baddogparts.com as to which I will have to modify the passenger side rail because it is too short.
It sure is a pain to deal with the rust issues on these cars huh? Good thing there are plenty of resources.