Aquariums: Cabin w/ Garden Build

Ok guys, I'm trying to build a 10gal aquarium for my girlfriend. I 3d printed the models, and painted with acrylics (I didn't seal it yet because I wanted to understand the layout better and test the bubble fireplace, but I'm planning on repainting and sealing them, just not happy with the shades.), and put in a few plants to get a better feel for the layout (2 motorcycles (to scale) will go between the garden and the cabin). The plan right now is for it to house shrimp and snails, and be filterless.
I have two questions.
1. The garden had 6 rows of 12 each. I'd like for it to look like an actual garden and not a chaos forest. I don't plan having much bio load in the tank, nor do I want to clutter the side walls (the back can be a full wall of plants, as well as having plants protrud to cover the air line and heater location), but I do want the plants to look good as well as have enough filling capacity to sustain the tank. I will also (hopefully) have a dense layer of Java moss on the roof of the cabin. (Id be open to a tight low dense ground over that could look like grass or something around the edges and between structures, but want to keep the garden area sand.
2. I would like to decorate the inside of the cabin, lights and all. It is currently empty and the floor is white rock, which I dont think I like and may print a hardwood floor patern as well as a table and chair to go in the middle. Hell, I may reprint the whole cabin to add those, but I would like to include space for wiring. Is anyone aware of a single yellow light ( like a lantern) or red/orange (for the fireplace) led that is waterproof? Id like to set up my overhead lights and the cabin lights to oppose each other on timers so that when the overhead goes off, the cabin lights up inside like someone is inside and a fire is going. Or if someone could point me in the right direction to build one.