I have an Uncle Howard's Barn and we love it. While we were talking through our project, we discussed raising the sidewall height, and they said they could do that for a couple thousand extra. After we got a first draft of the plan and saw how big the usable space was (there was only about 6'...
I agree with Vind. Auto window film works really well. Lets the light in and keeps prying eyes out. It's not that expensive and it works. You can even find some pretty cool graphics if you're in to that kind of thing.
Wow ... I'm surprised. We had a great experience with Uncle Howards. Really happy with the barn. Did you have a contractor build it or did you do a DIY?