I finally took the plunge and tried a piece of acylic. I turned this barrel with it. Certainly not perfect on the inside...There are some deep scratches from the brad point drill bit that I couldn't get sanded all the way out. Actually had a hell of a time sanding the inside at all, as my pin lock mandrel goes a bit too deep in the call. Might cut it shorter to make the next one a bit easier. I found turning the acrylic easy enough. I also figured out that wet sanding is really the trick to making the sanding easy, and am encouraged that I got the outside perfectly glass smooth without needing to flame polish.
I think the brad point bit caused the scratches on the inside. I used oil as lube when drilling. Does a regular jobber bit work better with acrylic?
I used thick CA to glue the band on. Hope that wasn't a bad move.
The insert is an echo double reed and the volume the acrylic barrel gives is amazing compared to wood. I need to find a source for acrylic so I can try turning some inserts from acrylic now.