Tip for strawbale construction: trim your strawbale walls before you plaster them. It's much much much faster to shave the walls than it is to even them out with loads of plaster. I use a weed whacker to trim walls. Some people use a chain saw.
Weatherstrip Windows Windows and doors tend to be the weakest link in your sound defense. Weatherstrip all points where sashes meet jambs, headers, and sills. In addition, fill any tiny gaps around moldings with an acoustical caulk sealant.
Pocket Shutters -Northeast homes of the and century had walls of exceptional thickness (as they were often made of brick), providing a deep window jamb whose embrasures, or pockets, could contain an entire interior shutter.