Posting this since I couldn't find him on here. A lower poly mesh of the MWO Executioner I came across. After several hours of plugging holes I was able to get a fairly clean slice of him lying on his back. When I checked him standing up however the back and chest are once again full of holes. Your results may vary and i might finish fixing it at some point but in the mean time here it is for anyone that feels like playing with it.
Edit: apparently the faces on the gauss barrel had reversed normals that cura didnt care about but crated issues for some slicer programs. that should be corrected now.