You will almost certainly hit a river/chasm extension digging that much up and down so plan for it. Also I doubt you will have enough room between the river and chasm to build all that (though I'm not going to count the squares to be sure). you have (IIRC) between 50 and 100 spaces between the river and the chasm, depending on how it bends if you want to count it yourself.
One thing I like to do is put the actual stockpiles in the room - so the carpenters shop gets a wood stockpile next to it, the mason/mechanic shop gets a small grey stone stockpile and so on. This saves room building other stockpiles and saves time with the worker hauling his stuff to the station. Also as part of this, I usually dump my craftsdwarf shop very close to the refuse pile to get the bones easier (as it seems 90% of the time it's making bone or shell something).
I don't think you need that many weapon/armor stockpiles. Typically you (or at least I) build a set of armor and a weapon per solider, there is no real reason to have a ton of extras sitting around. Melt the extras and use the metal for something else. maybe 1 small pile to hold armor before soliders put it on, or to store it in if one dies.
2 barracks that size is overkill. just one of them is PLENTY. Even if all your dwarves were sleeping in it (which I notice they are not) 1 that size would still be overkill.
The tree farm is on the wrong side of the river. Trees will only grow a few spaces to the right of the river (max of 110 from the cliff face IIRC) so to get the most out of it you need to put it to the left of the river.
I don't know if human caravans will use that trade depot. If they do, they will block traffic down your main hall while they (slowly) drive into it. If you are putting it inside (I usually do) it's best to make a separate path for it so dwarves don't have to crawl under it all the time.
Your farm is HUGE. with skilled growers you can feed 200 dwarves off something like 9x9 plot (maybe a little more). It's fine to keep it that big if you want, but you really will only need to farm every 2 or 3 years with one that big. Othewise the kitchen/dining room/farm area looks good and is similar (but much bigger) then what I usually do.
anyway, overall it looks pretty good. Everything is alot bigger then you need it to be, but that's not a huge problem if you actually end up with the room for it all. might want to consider cutting the size down in half for most rooms though, to make sure it all fits.