Structure blocks are one of the few things in Minecraft that do not generate naturally but can be obtained using commands. The command for getting a structure block is "/give @p structure_block 1".

Added a button in the GUI that generates a jigsaw structure starting from the jigsaw block, using given generation depth. Expanded the max size per axis of Structure Blocks from 32 to 48.

Once a structure void is available to players, it operates much like any other block with regards to placement. Right-clicking or pressing the use button will place a structure void.