As long as it stays dry my personal preference is a dirt floor. People mention that critters can live in walls with insulation, they can live under a wooden floor too. If you are taking that floor out anyway you might consider it. I added a couple of inches of dirt to the floor to raise it enough to keep rainwater out and covered that with wood shavings for bedding.
Where are you located? My main interest is your climate and weather. That could play a part in different things.
Is that a pipe in there for a roost? I don't like metal roosts. In cold weather they may lead to frostbite. (one place climate comes into play) I much prefer wooden roosts. Wood is easier to grip and are great insulators for the feet.
Does that have a ridge vent? If it does you are probably OK with ventilation. I understand it worked for chickens and rabbits before so you are probably OK but ventilation is always a concern for me.
Where are you located? My main interest is your climate and weather. That could play a part in different things.
Is that a pipe in there for a roost? I don't like metal roosts. In cold weather they may lead to frostbite. (one place climate comes into play) I much prefer wooden roosts. Wood is easier to grip and are great insulators for the feet.
Does that have a ridge vent? If it does you are probably OK with ventilation. I understand it worked for chickens and rabbits before so you are probably OK but ventilation is always a concern for me.