I am going to disagree with you on using this size until it is a year old or so... It will be much to small. The sizes they are giving are in cm. So a 60 wide 45 deep and 90 high is going to convert in inches to 23 wide 17 deep and 35 high.
@SharpShooter is absolutely right about this being much to small for a male. When you consider the fact that an adult Male Panther can reach a length of 20 inches.... I would say this would only be ok until the cham is about 7 months old. Even then depending on the Cham's growth rate that may be pushing it.