The chassis I used was the popular "4WD Robot Car Chassis", which is economical and practical since it has two platforms, 4 gearmotors, 4 wheels, and enough holes to mount the devices of our design.

                              4WD Robot Car Chassis

How to assemble this kit?

Assembling autonomous robot, recommendations:

• On the lower platform mount: Battery, gearmotors with wheels, L298N driver, power switch, and IR distance sensors.
• On the upper platform mount: Battery, Tesla coil, UV Lamp, Relay, Arduino and ESP32-WROOM-32 boards, and the ultrasonic sensors.
• On the top platform add (Not in Motion Version): Raspberry Pi and Arduino Pro Mini boards, rasperry pi camera, and reflector with servo.
• I used 22 additional screws to the ones in the chassis kit.

Now, I show you the parts assembled with their sensors mounted on the 4WD Robot Car Chassis in the figures below:

                              4WD Robot Car Chassis + L298 driver + Battery

                              GP2Y0A51SK0F IR Sensor

                              SRF-05 Sensor

                              UV lamp + Tesla coil

                              ESP32-WROOM-32 board