Insulated Box with Internal Frame and Expanded Metal Top

A rectangular open box with the outside dimensions of 1020mm wide x 1600mm deep x 200mm high, with 100mm wall thickness and 100mm base, mitered joints on all edges where base and walls meet, as well as vertical corner joints. Make the box lining and all outside surfaces from 0.5mm thick sheetmetal and the 99mm fill between them from styrene foam. Then build and attach an internal frame all around the walls from 1mm by 30mm right angle folded lengthwise in half sheetmetal. So it is an L shape. Attach this frame with pop rivets 50mm from the top edge of the box with the riveted vertical leg of the L shape towards the bootom of the box. On top of the resulting ledge, place a flat sheet of expanded 0.6mm thick sheet metal 820mm x 1400mm. Render the outside white and the inside black. Render the L shape section frame dark grey expanded metal sheet light grey.

Parameters

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