I have never seen insulation taped, down here in Florida, or in Montana. No reason for it, just fluff it, and put your ceiling up. Too bad about the floor, but if you had lots of time, and were bored, and had more money, you could build a four inch floor joyce, over that, and insulate that.
But sounds like you will be fine with what you have. After you get the walls and ceiling finished, you can build a rack for bow staves, and a bin for arrow shafts.
and a refrigerator, and comfortable chair, and a TV...... uh you know for watching those Yankee workshop, and Roy Underhill shows, and other programs like that, and Hunting channels, fishing channels, NFL, and.......
Wayne