This is my canopy (1306).
The front has 3 2ft mini doors which open upward to allow feeding and use of tweezers, scissors, etc without opening the full top (1307, 1309). I can get to most of the tank through it but can't get my arm fully in. I couldn't make it wider due to the space needed for the lighting.
Pictures 1310 and 1311 show the canopy with the top fully open and the lights mounted. I do have the lunar link lights in the middle.
I put the fans in for cooling. The only real heat are the ballasts that are mounted under the lights in the canopy.