I am planning on building the pedestal desk from Woodsmith 79. I'm going to be making some changes to it so I can turn it into a sewing desk for my wife. I'm going to be adding a leaf off the back that folds up to increase the "working area". Most of the time the desk will be pushed against the wall, but it will need to be pulled out every now and then to utilize the leaf. Does anyone know a good hidden lift system, hidden casters or such that are not seen from the outside and can lift the desk and roll when needed? Almost like a mobile base for your table saw, but not something that can be seen. Thanks in advance!