Very cool! I would love to have aquariums incorporated in to the walls of my house. You did good work!
Two notes on it though. One is that the betta is not a veiltail -- it is a delta or possibly low grade halfmoon. Second, if you really want your little guy to flourish, Bettas do best in water temperatures of 76-82 degrees F, so you might consider finding a way to add a heater in there! Stability in the temperature and having the proper temperature will ensure that his health stays better and keeps him lively and happy!