Building Materials
Content Expansion 1 is activated on EU #1. It is a guarded content layer over unchanged Worldgen V4, not another biome or generator profile.
Build full-tile floors and solid walls from Slate, Limestone and Mud brick. Craft unfired bricks from 2 Mud + 1 Clay at a Workbench, then put each Unfired mud brick into a fueled Campfire. The station still uses one Input, one Fuel and one Output slot. Existing glass smelting and window recipes remain.
Wooden boardwalk extends from a clear dry bank or existing boardwalk over shallow water only. It preserves water underneath, supports normal walking and blocks boat hulls. Deep water and occupied/blocked placement are rejected. A Stone hammer removes floors and returns their item.
Storage barrel has 12 shared slots and the same drag, split, swap, shift-transfer, claim, range and revision rules as a Chest. Demolition safely drops its contents and container. Copper lantern is a permanent local light, with no fuel slot. Hay bale unpacks into its four Wheat. Antler trophy is decorative. Glass block is visually transparent but physically solid. Glass window retains its framed panel collision; no existing wall is converted automatically.