Hello sir, first off good job completing this one, it's tough. There's a few thing that got me through it that I thought I would share with you.

1) Practice the chromatic scales individually BUT with the fingers you are going to use. (3-4-5 for the top note, 1-2 for the bottom) see Etude 10/2 for extra work with this.
2) Emphasize the left hand more. When I stare at my right hand doing all those thirds so fast, I think about it more and more and it tends to tighten up. Once you know if well enough, focus on the left hand (There's a beautiful melody there, by the way) and you would think about your right hand as much. This will ease up your right hand and make the thirds more fluid.
3) Find the spot that is hardest for you and WORK ON IT. And I mean work on it. For me, the killer was at 51-52 and 55-56. Just couldn't do those for a while. I just played right hand alone very slowly, tried different fingering, listened to different interpretations, made some long and some short, accented different notes.... and after a while I got it.
4) Finally, play it everywhere. No, not on the piano. You can find me at the dinner table, at the bottom of the pool, in the baseball dugout, and (oops) even during the sermon at church, just playing those darn third trills and runs. Getting your fingers used to doing those at places you're comfortable with will A) give you lots of good practice with thirds and B) make you more comfortable when you're practicing and performing.
Overall, great job, keep up the good work!
Pencilart3