Sheet Metal Electrical Enclosure

Create a parametric sheet metal mobile electrical enclosure assembly with dimensions 560mm width, 450mm depth, and 850mm height, constructed from 3mm aluminum sheet with 20mm internal mounting return flanges. Features to model: 1. Main cabinet body with an open front: left wall, right wall, top cover plate, reinforced bottom base plate with welded 25mm structural cross-ribs, and solid rear panel. 2. A fixed horizontal sheet metal divider shelf (3mm thick with 25mm downward stiffener flanges on all four edges), positioned 360mm above the base plate, dividing the battery bay (360mm clearance) from the upper bay (428mm clearance). 3. Two vertical guide U-channels (15mm wide x 15mm deep x 2mm wall thickness) fastened vertically to the inner front edges of the left and right side walls, running from the base plate to the divider shelf. 4. A removable lower slide-out front sheet panel (3mm thick, 360mm high, with a folded 15mm top return handle flange) seated inside the side guide U-channels that slides vertically upward and out. 5. An upper front sheet door (3mm thick) hinged at the top edge via a continuous piano hinge, featuring a folded 20mm bottom overlap lip that covers and locks the top edge of the lower slide-out panel when shut. 6. A circular bulkhead inlet cutout (58mm diameter) with four 4.5mm mounting holes on a 65mm bolt circle on the upper exterior right wall, centered 600mm from the floor and 100mm from the rear corner. 7. Two 120mm square ventilation fan/grille cutouts (115mm center-to-center hole pattern with 4.5mm corner holes): an intake cutout positioned low on the upper bay left wall, and an exhaust cutout positioned high on the upper bay right wall. 8. Two pairs of battery tie-down strap slots (35mm long x 8mm wide with fully rounded 4mm radiused ends) laser-cut into the bottom base plate, spaced 320mm front-to-back and 200mm side-to-side. 9. Four caster mounting plate pads (90mm x 90mm with four 9mm bolt holes) welded/fastened beneath the exterior bottom corners of the base plate.

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