Problem surfacing with 5 sides

Hi all, I'm having a little bit of trouble surfacing the neck of a guitar where it meets the body (file attached of my progress so far). I have attempted this by creating surface boundaries on the flat surfaces then filling the surfaces, but all I'm getting is errors. My first go at this was using the loft feature, which I quickly found out was not the right tool to use as there are far too many surfaces. I've tried watching surfacing tutorials, but I haven't found anything that I can apply to this situation. All help is appreciated. Cheers.

Patrick

SolidworksSurfacing