Thanks everyone for the compliments.
Crvz I am not sure if I will paint the inside of the stand or not. There are 2 reasons (other than being lazy). The air circulation in the cabinet will be constant so I don't expect a humid enviroment. Two, My guess is if I were to have water damage it would happen on the bottom rails that are bolted to the floor as they are the only parts that could have any standing water. Having said that I am open to other information.
The exterior will be painted the same as the rest of the room which is being completly repainted. It was built to match all the other walls, fireplace mantel and cabinets in the room. What you see in the picture is unfinished wood.
R-BallJunkie, I just moved from your area. I use to live in Glenshire East right off West Airport. Given the constant movement of air in and out of the cabinet, I do expect a significant evaporation rate but would have no idea on how to calculate that. I have a couple ideas for top off. I thought about having an RO unit line plumbed to the room but decided not too. I know many people have done it but since there isn't a drain in the floor, it made me nervous. I didn't want a constant supply of water flowing into the cabinet when I was away just in case something went wrong. I will most likely use an elevated holding tank that will gravity feed my sump and use a float valve. That way should there ever be a problem the water to the floor will be limited.
I also paid my dues today so now I guess I'm an official Marsh member.