Too harsh on yourself, you are, Frosty!
I think your kit looks fine. Some work to do on the joints (top of fuselage for instance) and cleaning up your parts (there appear to be a bit of sprue left on the tip of the middle wing) but this was no 'normal' project either. Having seen the quality of your work with other builds, I would not worry unduly! I had to buy another kit to get my decals right, and I may build another one soon, taking my time too...
And as to the markings, there's a lot of confusion and little evidence when it comes to identifying and modeling those little Fokkers..
Those are two pics of, supposedly Fokker Dr.1 213/17; Kempf flew this aircraft in Sept 1917, but by Novemnber he was flying aircraft 493/17.
213/17 should have the earlier form of German cross, while 493/17 had the ones shown on your kit. However, on 493/17, the name and all lettering was white and outlined in black, as was the fin. 213 had an overal white fin... 213 had the white part of the tailplane on the left, while it was on the right on 493...
Your kit comes with mixed markings for both Dr.1 Kempf flew... But that's not your fault!