Hey, i'm exactly like you Necksmasher... I hardly ever finish a scene if its up to me to finish it or not.
Are you by any chance a perfectionist? I know I am, and can work on something so small for so long, trying to perfect it, that I simply get bored...
Your scenes looking good. Is it by any chance possible though to make the hole, or the instrument itself slightly smaller? On my dads guitars, the acoustic hole in the middle is almost as big as the left and right edges of the guitar:
http://www.mandoweb.com/M_Claires%20Guitar.jpg
Like that for example :)
Good work so far. What are you planning on doing with it?