The sealing needs to be at the plane of the air barrier. So I would attack any and all nooks and crannies that lead to the outside. What is the sheathing? If it's some sort of sheet lumber then you just seal the visible seams and then seal the stud/sheathing joint where the vertical seams are. You won't be able to properly seal the vertical seams without access to the outside of the sheathing but it should do a pretty good job. The only need for plastic inside is to protect the fiberglass.
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You know you're an ecorenovator if anything worth insulating is worth superinsulating.
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S-F: "What happens when you slam the door on a really tight house? Do the basement windows blow out?"
Green Building Guru: "You can't slam the door on a really tight house. You have to work to pull it shut."
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