You can surely use the cage for the copperhead once the snake grows up some.
One thing about Visions - they have that lip around the door and on top of the upper door tracks where a snake can and will hide in. With a venemous snake you must make sure not to put your hand where a snake on the top lip might be able to strike it. I know copperheads are pretty mellow, but anyone would feel pretty stupid getting bitten because you didn't see the snake sitting up there. Obviously as the snake gets large, you'll be able to tell better if it is up there because it won't fit without hanging over in view.
I agree with you - Neodesha cages make it easy to access the cage and see everything going on at a glance. By the way, they are supposedly coming back - www.neodeshacages.com I think it is or something to that effect. I hope so.
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Mark 