Smart Chassis 4WD

Bought a Smart Auto Chassis 4WD on AliExpress and as always: the acryl chassis was cracked on delivery. So I decided to draw my own chassis.
I have designed it 1cm wider so a L298n motordriver could fit between the tt motors.
I have a small 3D printer so I split the chassis is printable on a 140x170mm print bed.

I used the following materials.

- 4x tt motor
- 4x speed code disk
- 4x optical endstop limit switch
- 4x wheels
- 2x L298n motor drivers
- 1x Wemos D1 R32 ESP32
- 3x 18650 25A cells
- 1x BMS print (25A)
- WII remote and nunchuk
- Switch for turning off and switch to charging mode
- Charching input

I try to use only m3:
- ?x ring m3
- ?x lockring m3
- ?x m3x16mm
- ?x m3x12mm
- ?x m3 bolt
- 8x m3x30mm (lowhead)

Update 21-12-2020:
Added a firmware.bin file and a zip with the arduino platformIO project.
This is a firmware for the wemos board connected at the L298n motor driver boards:
// right back
define RB_FW 27
define RB_BW 16
def