Hey brother. Just to throw in my two cents, I think you have a solid foundation here (I'm currently executing an upper/lower split myself but with 5/3/1) but I just want to bring up some points to consider.
Given the lack of background I'll assume that you're an all natural intermediate lifter, SO you need to dial in on those big compound movements because those are gonna give you the most bang for you buck when it comes to the gains. Make sure you're still hitting everything though. Focus your upper days around vertical & horizontal pushing and pulling. On your lower days you should focus on Squats and Deadlift variations. That means all the extra assistance work you have in there could kick the bucket. Instead, focus on weaknesses with your assistance work.
A better alternative to any lat. pulldowns imho would be pull/chin-ups. If you can do about 10 reps for 3 sets, then start adding weight with a dip belt. If you want to hit the lats in another way try straight-arm pulldowns.
I also think that the arms on lower day may be a little bit of an overkill since you already work them with the compounds the day prior. If I feel like it - I'll rep out some arms here and there but dips and chin-ups are plenty for an intermediate natural lifter. However, if you feel inclined to do them still I would probably tack them onto a second session on your upper day, or at the end of the upper day.
There's my input, take it or leave it -- in the end, at least have fun doing it. =)