I would classify that as a tub.
I would attach a UTH to the underside that covers 1/3-1/2 of the area. This will provide the basking area/hot side temperature of 90 degrees. The rest of the cage/air should be kept as close to 80 degrees as possible. This can be accomplished by keeping the room close to 80 degrees or by suspending a low wattage heat bulb.
My biggest fear with that cage would be escape. Make sure you place something heavy on top to hold the lid in place. I have found that a brick on each corner works really well.