Interlocking 4-Panel Enclosure Shell

"Act as an embedded hardware engineer. I am building a low-cost autonomous shelf-scanning robot on a $500 budget. Generate a complete schematic and Bill of Materials for a main controller board. The system must use an ESP32-WROOM-32 microcontroller as the brain, an ESP32-CAM module for the vision stream, two standard L298N dual H-bridge motor drivers to control a 4-wheel drive base, a 5V buck regulator for logic power, and standard pull-up resistors for an I2C sensor bus. Optimize the footprint to be as small and compact as possible, using standard 0603 surface-mount component packages." The outer structural shell is composed of four interlocking panels, with each individual vertical panel measuring exactly 150mm in width, 200mm in height, and 3mm in thickness, which combines to create a robust, lightweight outer wall. The interlocking puzzle joints along the top and bottom rims feature a 10mm deep dovetail pattern with a 0.2mm tolerance gap, allowing the pieces to slide together smoothly without being too loose. On the smooth exterior face, four corner mounting holes are set 10mm inward from the edges, counterbored 1.5mm deep with a 6mm diameter to allow standard M3 screw heads to sit completely flush with the surface. On the interior face, the four integrated electronics standoff columns stand 5mm tall with an outer diameter of 4mm, spaced in a precise 50mm by 80mm grid to line up with standard microcontroller boards. Each column is pre-drilled with a 2.5mm inner pilot hole designed to tightly grip standard M3 self-tapping plastic screws. Finally, the built-in vertical wire management channels running down the sides are carved 4mm wide and 4mm deep, providing plenty of clearance to Route standard 22 AWG power and data cables cleanly away from the spinning wheels and central circuit boards.

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