[souffle]

I would leave him in the current cage till you are able to make a secure lid for the detoft from Ikea as they can very easily climb out of these. You must have a lid for these and not just an open op. Even a small hamster could climb on something and get out and also if a cat, dog or other animal somehow got in it could catch a hamster. He will be just fine till then and you don't want to risk an escape!