Ideal Cage Dimensions

Alright...so, say a person was planning on custom building a cage for a BP.
What would the ideal dimensions of the cage be? I'm talking about a cage that would house an adult...

Thanks,

Chapskis1

When I had my 3000 gram female in a cage it was a 24x24x12 cage. She was just fine. I also plan on putting her back in that size cage. If the snake is big enuff you can do 36x24x12 but I would not go with a bigger floor plan then that.