the structural panel assembly structure has a rigid , substantially plane panel and at least one one - piece attachment part , produced by moulding , glued to the panel . the attachment part has a first plane face including a recess that can receive a glue and rims intended to retain the glue around the recess and at least one opening . a bar is fastened to the first plane face . the materials of the attachment part and the panel are composite materials and the bar has a metal insert that is inserted when moulding the attachment part and is intended to be threaded .