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?
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
UV lamp + Tesla coil