The edge of Middle Door doesn't match up with the edge of the upper surface.
This stems from the fact that the end of Curve10 doesn't pierce Curve6.
Ideally you could fix the curves so that Curve10 intersects Curve6, but that may be difficult. Something else that happens to fix the problem is if in the MIddle Door loft you switch the profiles and the guide curves. So if you use Curve13 and the edge as your profiles and use Curve10 and Curve12 as the guide curves, then the edges will match up. You'll need to fix some of your curves and selections after that.
Another note is that in your Rear Fender Knit, for some reason the first two selections are faces instead of Surface Bodies, and that resulted in those two bodies not being absorbed by the feature and then you had duplicate surfaces. You should clear those face selections and add the bodies instead.
Once you do all that, you'll be able to knit everything fine at the end and add the fillet along the edge you mentioned.
Thank you, Jamil!!