There is the Savic Plaza 100 (100cm x 50cm) for about £80 new or less for a second hand one which can be fitted out with perspex panels by a company called Viking Lazer. The panels stop climbing and also allow for really deep bedding. You can buy one or two panels or a whole set, depending on your budget and whether most of the climbing is concentrated on for instance the front of the cage. Or you could use cardboard at the back and perspex on the front. The panels are easily fitted using wing nuts. Wheels need to be 12 inches or 30cm for adult Syrians to run on safely. If you have had budget, Night Angel wheels are good and quiet. Yes, risk of falling is a hazard for bar climbing hamsters. Rats and mice are quite good climbers, but hamsters are designed for burrowing and ground level is safer for them. Welcome to the Forum! You have a beautiful hammy who is lucky to have such a good owner