Hi folks   

I've just made a model to be 3d printed (cooler mount for my laptop). I could have modelled this much better, but I essentially created the outline of everything and lofted it, then shelled it. It's now created weird corners and vertices inside so I'm looking to fill in some of the internal geometry to create a single solid body

In the second image you can see a section view, and two (very faint) sketch lines that are boundaries I'd like to fill in from so its got a clean opening at the front, through the middle and out the back. 

Any help much appreciated.