I've looked to stone block definition and found some undocumented stuff. [FONT= ']<Direction>[/FONT] - Don't know what it does. [FONT= ']<Rotation>[/FONT] - Restricts block rotation, possible values (Both, Horizontal?, Vertical). Yaou can remove this node to remove all restrictions. [FONT= ']<GeneratedBlocks>[/FONT] - defines list of additional blocks generated on edges. Interesting is there's no way to define where those will be place. I think those entities defines in model file. For some blocks Ceiling Inner Corner those entities arent defined correctly. [FONT= ']<BlockVariants>[/FONT] - this guy allow you to group blocks together and switch them via mouse wheel. The structure is pretty simple [FONT= ']<BlockVariant><TypeId>TypeId</TypeId><SubtypeId>[/FONT][FONT= ']SubtypeId[/FONT][FONT= ']</SubtypeId></BlockVariant>[/FONT]. Please note that blocks defined inside this node should have either [FONT= ']<Public>false</Public>[/FONT] or [FONT= ']<GuiVisible>false</GuiVisible>[/FONT] in order to hide them as a separate block from block selection menu. Have a few question to devs: Can we have sources of currentrly visible blocks in order to finish those hidden (missing textures, wrong place generation block, etc.)? How can I change material max integrity, I've played with Components.sbc and didn't found [FONT= ']<MaxIntegrity>[/FONT] working.