- I guess the unit frames would look much better with a bit smaller portraits.
- Personally, i would prefer the first design choice, it looks more compact rather than super long actionbars (12 vs. 24)
- The size of the main action bar is okay, but the left/right edges do not feel like fitting with the bottom bar (mostly the problem with flying bars)
The thing is, you will use the main action bar for cooldown display, but the other side you want to look at the whole bottom bar (like me, damn its super hard to not look at it, after 10 years..) So the effect is, that the action bars do not feel connected to each other, cause you use 2 different places.
like d87 said, most people use other stuff for cooldown tracking, so that it would be the best way to focus on "connected" action bars. 1x 24's layout + a 12's ontop or something like that...or make the whole bottom bar a flying element.