You dealing with glass carboys and power tools. Keep them away from eachother while building. the carboys are dangerous enough as is. Be carful when hanging them and especially when getting them down. A ladder or step stool is the best bet if you can't reach your ceiling. There are plenty of horror stories about people almost dieing from broken carboys. Please be careful. Do no hange full carboys. This meathod is meant for empty ones to hang for drying and storage. Not for full ones for transfering liquids.