The vapor barrier was a gift from my friend Joseph Becker. He had it left over from a job and I only needed a small portion of the roll.
Recently, we found cork insulation at the restore for $5 a batt. We bought 4 batts that were all about 2' x 4' and 2" thick. Our plan was leave them exposed in the wall because the material is so cool. Since it was in 2" thick sheets, I got 1 and 1/2" rigid foam insulation to place behind the cork insulation so the wall is the same thickness as the studs. We left them exposed above the bench back as a head rest. We did the ceremonial head butt and put them in place. Below you can see the top of the bench back, and the transition to the exposed cork wall.
Here is another vantage of the exposed cork wall and new bench back.
The front/kitchen area with moisture barrier up...
Now the walls are up the place feels a lot smaller. I kind of miss the exposed studs, but I also don't mind working in a t shirt while it is cold outside. There are only a few more pieces of siding to be installed on the back and a loft door to build, but the weather has transitioned me towards the interior.