44 metric tons required to press a 4 layer dimple and C tone field in the center of a Saraz handpan. After pressing a note, the interstitial still needs a LOT of pneumatic hammering to achieve the ideal shape.
There are a couple facebook groups concerning handpan building. The biggest and oldest I am familiar with is called "exchange of knowledge handpan". There is also "handpan building explorations". "Jimmy's House of Hammers" has tools by Jimmy James, one of the creators of Aciel.