How to fix weird edges when doing knife project? I am quite new to hard surface modeling but wanted to get into it a little bit. I am doing something like a Porsche 911 back and wanted to cut out the bonnet area. Since I thought Knife project would be easier than boolean modif I used that. I also used edge wight and bevel modif to make harder edges. After making the cut it produced those weird shapes, fliping one of the UVs helped near the bottom, but not completely. I know its something to do with the weird face and the fact that its an N-gon, but connecting the corners to something doesn't help at all.
Any and all help will be super helpfull.



here is a link to the .blend file >
 https://drive.google.com/open?id=1aodNFbnb5AjM3tHgwmuXCke7z6NYVbBY
I dont know how else to add it sorry. 

there are also rough background images that I have been building off of. I dont need the whole car, just the back of it that is the reason why it cuts off like that.
So basically. Learn something new every day, even if it's super simple. Conecting Ngon edges to some lines solved the weird bits. I used Knife tool and made every odd shape into little squares.