Arduino Robot Kit

After buying a basic 2 wheel kit I decided it could be a cleaner build so I hacked and designed a chassis.
Instead of using a uno shield I found some really nice Arduino Nano shields that provide all the connection pinning needed to add:
Motor speed sensors x 2
Servo x 1
ultrasonic x 1
Motor control duel x 1
Bluetooth module
IR line follow x 2
Still has ports free.
SW basic can be taken from the Igloo robot kit and is free to download on their site.
I would recommend a visit to the droneBot Workshop as a lot of guides here on programming.
https://dronebotworkshop.com/

The rear caster was a 99 cent swivel type but there are holes for a 4 screw type also.
The nano path is very low cost and with the shield an easy build but the shield fittings are same as Uno should you have one spare!

2 versions of the battery box, 1 glue to fit, i did this or the other that picks up on the board screws.

Nano I/O Expansion sensor Shield Module Compatible For Arduino UNO R3 Nano V3.0