Good, except you want the skimmer after any chamber that contains your bio blocks. The trend seems to be fleece rollers instead of socks, so at the very least plan to be able to upgrade to that later.
I'd also leave enough room in the baffle before the return pump for a black sponge (see Red Sea sumps to better illustrate).
1st compartment will have the Clarisea 5000. It should be here today or tomorrow. I have used filter socks before. Nice but too much changing. I have been using a Theiling Rollermat but its so big and bulky which is why I don't just change the motor and put it back in. The sump is large but the space gets small when I'm underneath.