After drilling the hole in the tank and marking the spot where the hole in the stand needs to be drilled one then realizes that to drill the hole in the stand you are going to end up drilling right through the main supporting framework of the stand. Lets discuss canopies. A canopy sits on the top of the tank and usually covers or hides the lighting system. Most canopies are about 6 inches tall and sit down, slightly dropping over the edge of the tank by about 1 inch. What you want is for the canopy to extend down past the water level point in the aquarium.
Most canopies have a lid that opens half of the canopy top.
It does not feel good. The best canopy arrangement is one where the entire top, including the front of the canopy, lifts, or pivots, from the back edge of the canopy, and lifts up and out of the way.