Your build looks pretty good! Nice job on the retraction cables for the bottom half of the door - that's a nice little detail.
The only nitpick I could offer is that the tip tanks shouldn't sit level - they should droop 2-3 degrees nose down. That's not an easy correction to make, though... one of my Learjet kits has a twist in the wing, and the tanks actually want to point in two different directions!
Also - the recogntion lights on the front of the tip tanks have the inboard half of the lens painted black, so as not to blind the crew.
(Pictured is one of my 1:1 scale rides for reference)