What an awesome tank! How do you like the Vertex skimmers? I looked into them when they first came out for a tank that I eventually took down, but may be setting up very soon.
Awesome build! Are you planning on adding doors at the end of the canopy? I have a 300 DD. I have doors similar to your's in the front or I can flip up the front of the canopy. I don't have any doors on the sides are regret it! It's a bear getting to the back of the tank sometimes.