A method for forming an electronics enclosure is disclosed. The method comprises extruding a backplane having a first extruded length, the backplane comprising slots on opposing sides of the backplane, wherein the slots extend along the first extruded length. The method further comprises extruding at least one door panel at the first extruded length, wherein the backplane and the door panel each have extruded hinge features for pivotally coupling the door panel to the backplane, and coupling at least two cast metal plates to opposing ends of the backplane, where each of the cast metal plates comprise a gland that aligns with the slots of the backplane to create a continuous channel for inserting a seal.