I have made a dig box and a side extra bit for sleeping if my Robo chooses. He sleeps anywhere and loves to burrow. I made the box out of OSB wood and cut three holes in the front and two in the roof and one in the side. I have filled it with wood shavings and the sleep compartment with tissies.
It is not protected with anything as he can chew away if he wants too.
He has been in it tonight. He went in one of the bottom holes and came out through the top hole near the corner of the cage, had a good look around then went back down and out again. He then went through the hole where the tissue is and had a good shuffle in there before coming out and having a drink and a play in his sand bath. I think he likes it. I have scattered some de husked sunflower seeds inside and on top. I will see if they are gone over night from the top of the box. Ha hasnt used the ramp yet. But there is plenty of time for him to do that.