$400 for both tanks and all the plumbing?!?! That's a crazy good deal.
Just a few thoughts for you... If 2.3 is the height you may want to rethink going to just 2.
I'm an average height guy and with my 2 ft depth tank and I no longer wear a shirt doing any maintenance.
If your still dead set on the height, make sure your builder is using at least 3/4 inch acrylic.
For a freshwater sump I found just an open tank is best.
All you really need is holders for your mechanical (filter socks) and the rest can just be bio media.
I built mine with a crash box for the overflow, no noise and I can change filter socks out without stopping flow.
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*why can't i rotate!!