im not completely understanding this.
i think you are talking about putting a tank outside in a gazebo? correct?
you also state that this recieves alot of light, your going to have a huge algae problem that i dont think can be avoided. i think if you want to do it, plan on alot of algae cleaning maintnance.
another issue would be weather, just about everywhere the temp drops at night, how do you plan on heating the tank, actually a better question is what do you plan on keeping in the tank, and what size tank do you plan on keeping?
and welcome to the forum.