Congrats on your decision and welcome to the addiction!!
As far as your caging ideas, I will add some pointers....
Neonates can sometimes be very 'gun shy' when it comes to caging. If it's too large, they may not feel secure enough and go off feed. That, added to whatever's going on around the cage (foot traffic, TV,) etc etc can stress them out. That's why most will suggest a tub for the young ones. Makes them feel more secure.
If you are dead set against using a tub, you may want to think of an older, more established animal that is accustomed to being in a display type cage??
As for your set-up. It sounds nice, but rocks would be a B**ch to take out and clean every week. Pools of water can become stagnant and breed 'yuckies'. I change water bowls and clean them with a bleach solution every 2-3 days. Live plants are good--So are fake ones...I hang Wal-Mart plastic plants from the top of the cage using cable ties. The more 'hiding areas' the better.
Since you are going for the naturalistic type display, Cypress mulch would be a good choice of substrate....I personally use newspaper in my display cages and paper towels for my neos.
Any way you go, make sure you buy an animal from someone who will offer support in case you have questions. Stay away from imports for your first animal. Many (NOT ALL) are poor feeders and can have some health (parasitic) issues...
If you have any questions, please feel free to e-mail me...
chondrokeepers@yahoo.com