More False Wall / Sump Design Feedback

[Canadian]

Thanks again to those of you who offered feedback in my previous thread.

I've taken your suggestions into consideration where I could and have a new design that I would appreciate some feedback on (because I'm sure there's something I'm missing).

A few points of detail:

Pictures are to scale.

In the front view you see the cutout overflow on the right which is 1" deep and 5" long - this was done based on the RC overflow calculator. I wanted to max out the Hydor rotating return (shown schematically on the left) at ~300GPH hence the 5" width. This overflow section will be blocked off by egg crate material.

In the back view you see the baffle design. The right hand baffle was designed to keep a constant water level/pressure for the Tunze DOC Nano skimmer (shown schematically). The height of this baffle is as tall as possible while still keeping the skimmer low enough to account for the cap I intend to put over the false wall/sump to hide all the ugly equipment.

My two main issues are whether or not the Tunze skimmer will require a hole being drilled in the false wall cap (not shown) to allow fresh air into the venturi of the skimmer. And whether or not the far right hand chamber is going to be a large enough volume to account for evaporation (as designed it's about 3.2 gallons when full to the top of the skimmer baffle - display dimensions are ~ 24 x 18 x 17 = ~ 30 gallons with the entire tank being 24 x 24 x 18).

Let me know what you think.