This is pretty much my first shot at surfacing and I have run into a few problems.  I can not Knit this surface and turn it into a solid body...  Also the edges don't seem to lineup that well.  Does anyone have a better take on how to model this part differently?  What am I doing wrong with my surfacing technique.  Basically I have followed a youtube video of the Mouse design. I attached the SW file and an Image of what I need to design.

Thank you in advance for the help.