welcome to fishlore!!!
I dont think you can go for more than 2 gourami's in a 29 gal..and then you might need a ton of hiding spots to be safe...a backup tank in case of an issue with them might also be needed...I LOVE teds idea of the cardinals with plants and driftwood..that would be amazing!
ottos would be a nice addition as well..but need the established tanks for sure...
I am worried about the fact that the tank is empty..how are you feeding it to keep the cycle alive? the bacteria will die without some type of
ammonia source so making sure thats happening is a must....good luck and let us know what you decide!