If you don't have a lot of experience with aquariums, paludariums and such I'd personally stay away from such a large endeavor to start out. For many keepers just adding live plants to the mix can be a whole new learning experience. Having water quality and added humidity issues added to the equation might make it even worse.
That said, people use Pond Armor to make giant aquariums for fish out of wood so if you feel like going for it I say go for it as long as you post pics.