There's a couple of home-brews over on the Talkbass website:
https://www.talkbass.com/threads/pro...r-way.1136733/
I know there are some really good books out there on home studio construction but I don't own any personally so I'll defer recommendations to others.
Be sure to check out the "Post Your Recording Acoustic Setup" topic:
http://www.acousticguitarforum.com/f...d.php?t=273107