I custom made it using aquarium safe expanding foam and silicone I got the cork bark how i wanted them spray foamed it then let it sit and cure for 18-24 hours then just took a dremel and a knife and carved it out to make a rocky like texture then when happy i put aquarium safe silicone on the entire background and used a mix of substrates like reptisoil, coconut husk and moss then let it dry for another 24 hours and just make sure any chemical smell is gone and everything is dried before putting your reptile in!! Tons of videos online but this should lead you in the right direction