Abstract: A method of manufacturing a load structure may include forming a panel having a first side and a second side, clearing a fill passage through the panel, providing a tool having a first tool portion, a second tool portion, and a cavity disposed between the first and second tool portions, connecting a fill busing to the tool, the fill bushing includes a flange, disposing the panel within the cavity, disposing the fill bushing within the fill passage, connecting an injection gun to the fill bushing, and injecting a material through the fill busing and the fill passage such that one of the first side or the second side of the panel is at least partially covered with the material, the fill bushing is arranged within the fill passage to block the coating from contacting the other one of the first side or the second side.