Assemble the Mantle Box (Initial Glue-Up)

What happens here

To prepare the main mantle box for assembly, apply painter's tape along the seams where two long planks will meet. This tape can serve both as a guide for adhesive application and to prevent excessive glue squeeze-out onto visible surfaces. Then, apply a generous bead of construction adhesive between these taped lines using a caulking gun. Carefully bring the two planks together, forming the initial V-shape or open box structure of the mantle, ensuring good contact with the adhesive.

Goal: Glue the main wooden planks together to form the mantle body.