I hear from numerous people that leos don't need a basking spot. And although this may be physiologically true, my leos love to "bask" under a red bulb all night. So, I built their enclosure with a shelf as you described. I have attached a picture of our lastest enclosure in this message. This enclosure is 21 inches high.
Think about these things and determine you height:
Are you going to use a lid on the enclosure? If not, you must measure high enough so the lizard cant get out when standing on the upper ledge.
Lighting and hood? your pet(s) should not be able to reach any light bulbs.
And are you feeding crickets? You want to make sure crix can't climb out as well.
Good luck. Please post pics when you are done!
