BLUE TONGUE SKINKS

I've seen pics in the gallery of a two level bts cage, and was wondering if they would use both levels? I think that could be a cool feature to incorporate into the custom cages if so.
Does anyone have any more info on these? I used the search function, which gave me some interesting results but nothing on topic

Does anyone have these? How are they to clean? what would be on each level?

I want to make it to because i have 2 terrariums ( 75 cm long , 60 cm deep and 50 cm high ) and i'm going to make a level at the back at 15 cm of the ground , 75 cm long and 25 cm deep ; with an entrance to go in.
So acctially something like a cave or big hide but he also can go on top of it.
So the skink has more groundspace.
I going to make the roof of the thing removable for cleaning.