Lookin sick man, great stab at a first attempt so far and it looks like you are going all in, as I would expect.
Is that the same tank from your RC TOTM win? Looks similar, but with lilypipes and CO2 in place of the MP10's
Still crushed about the loss of those magnificent SPS pieces...
Look forward to progress, and really digging the iwagumi scape. I think that's ideal for the shallow cube, a little hair grass, maybe some dwarf baby tears / glossostigma, and your are set! Can't forget the cardinal tetras and high-grade crystal shrimp either!
Edit: BTW, forgot to mention that you need to check out Cal Aqua Labs. Not hating on ADA, I know their US importer based here in Houston and their stuff is great (and I use a bunch of it), but Cal Aqua has an inline CO2 diffuser that will work great in your space limited nano and not take up valuable real estate.