SAD WIDDLE WABBIT NEEDS A NEW CAGE

PLEASE HELP. I have one Flemish giant rabbit "Copper" who has grown too big for his existing cage. The current cage was ideal for when Copper was a baby and there was plenty of room for him and another companion rabbit to thrive. However, Copper has grown considerably larger and despite now living alone, it would certainly be better for him to have added room to roam around in. I have used resources from around my house to create a playpen in order to allow Copper to wander (hop) around and stretch his legs. Unfortunately, he cannot be left in there without my supervision and as such, the playpen remains a temporary measure and a larger permanent residence will be necessary for his well-being.