Old metal pipes should be dismantled. First, to close the long-installed pipes with panels is undesirable. After all, they can flow. It is better to carry out wiring with metal -plastic or eco -plastic. The cost of repairing the bathroom increases slightly from this, but you are insured from serious expenses in the future. Secondly, the distance from old pipes to the wall is quite large. To close them with panels, you will have to reduce the useful area of the bathroom. And one more thing: before starting to install the frame, you need to decide on the places in which the wires will be displayed and the wiring is wiring.