http://ecomodder.com/forum/showthrea...ion-21952.html
You can confirm the angle of the hatch with the Template Tool. It looks to me like it should be opened a little more. At that point the bottom of the hatch blocks the view in your rear view mirror. I'm not sure what to do about that.
It looks like the hatch could be opened all the way and then closed on a rubber rod or tube to seal the top. The triangular side pieces should be flushed to the contour of the C-pillar. The bottom could be a tub to increase the size of the boot, or a subwoofer box if you have a sound system. It needs to extend to a difusser at the bottom for maximum result.