I would only use that driftwood for shrimp......
Unless you make some small modifications.
Like SpecG mentioned Bettas are very inquisitive, at least the ones I've owned.
- A betta would try to swim through those natural cracks/splits in the CENTER of the wood itself. It wouldn't take long for a betta to lose most of it's fins or get itself wedged in the driftwood.
- One thing you could do is to jam a moss type plant or something similar into those cracks, so the betta can't get through.
Other than that, all the elements look great.
Sorry to hear about the other tanks you lost from the flood.