Some Feedback on My Tank Design Please

[Canadian]

Hey folks! I'm finally finishing up my masters in physiotherapy and now that I'll be back in the working world and have a little more time on my hands I'd like to get back into the hobby after a long hiatus - prior to which I was very heavily involved with reefkeeping in Victoria.

I've decided to set up a small reef tank and after looking at the all-in-one tanks out there I think I'd be happier with a custom tank.

So now I'm in the process of planning out the construction of the tank and would really appreciate some feedback on the tank design as I've always plumbed my tanks with a sump and this is the first false wall tank I've built. I've attached a couple of schematics below. The tank dimensions are 24" x 24" and 18" tall with the false wall being 6" from the back of the tank. The tank will be frameless and I'd like to run it open-topped.

A couple things to keep in mind when looking at the pics: I plan on putting two Hydor Rotating Water Deflectors on the two holes in the false wall which will run off a Y'd return pump. I'm also leaning toward putting a Hydor Koralia-2 on the right side of the tank about midway down the false wall.

For lighting I really like the Clip-on Coralife Aqualight Advanced that looks kind of like a desk lamp. While I'm not a big fan of Coralife products this seems to be a better option than the JBJ equivalent. I plan on running a 20,000k 150W HQI. I'd also like to put a Tunze 9002 Nano DOC Protein Skimmer in the back compartment.

My main questions are:

1) What would you recommend for a return pump? (assuming the tank will be a mixed softie, LPS, and low light demanding SPS)
2) Anyone with any experience with the Tunze Nano skimmer know what kind of water depth I need to run the back compartment at?
3) Any suggestions on a better way to lay out the back compartments? (I plan on stacking some foam and ChemiPure in the overflow section)
4) Any concerns with the tank design? I was thinking 3/8" glass but I'm not sure what the requirements are for a tank like this that is fairly wide with a reasonable height and no frame or brace (I intend to have SeaStar build the tank)

Sorry about the stupidly long post!