Nice hardscape so far! I'll be following this tank and I can't wait until you start putting livestock and plants in. I have had success with Mini Dwarf Hairgrass (Eleocharis accicularis 'belem') fully carpeting in a low-tech, stock Fluval Spec.
I just got one of these myself! Havent set it up yet though. I'm planning on stocking mine with either a betta. Or possibly microcrasobras and shrimp. OR CPD and shrimp. I wonder if threadfin rainbows would be okay in a tank this small?