I've always wanted something like this as well - they're beautiful tanks!
9 gallons seems a little small to me - you'd have 4.5 gallons of water, minus any hardscape, probably leaving you with around 3 gallons. Depending on lighting, you could fill it up to ~1" from the top and have a lot more water volume, giving you more space to play about with and probably a more stable tank.
I'm slowly working towards a tank with emergent growth and have had good results from anubias hastifolia and mondo grass, both of which are tied to spider wood with the roots/rhizome in the water and the leaves above it. I also have water lettuce and duckweed for cover, and am waiting on a dwarf tiger lotus to grow in.
I'm also using these lights, which are working well so far, although my plants are low-light and the tank is in a window. They're great for the price though and give you a lot more freedom to scape than the light in the picture. I have 2 on a 25g, 1 on a 9g would probably be fine.
A lot of people seem to use shower caddies to grow emergent plants out of, although I haven't used them personally. Here's a link to the sort of thing that I mean: https://www.amazon.com/mDesign-Bathr...dy+suction+cup
Any of the livestock sounds fine, although as chili rasboras are so tiny, you'd have to make sure that they can't get into anywhere they shouldn't. Male endlers are also nice and small, and have the additional bonus of being really quite easy to keep.
There's photos of my tank in my journal, should you want to have a look at how the lights work. Hope this helps!