What are they building!?!

In this video continue working on my secrete lab project by construct the main room of the lab:) ==+----------------+== Mods i use: * (new) Lopano's Furnace * (new) Lopano's No Stack Food * (new) Lopano's Fast Carts * Wield3D * Character Animations * Edit Skin * Just Zoom * More Decorations * Better Screwdriver * Shallow Ores