One need to be familiar with
*Arduino IDE,
*Building basic apps using ai2.
*basic sensor modules, etc

Shape can be anything as per the choice of make.
*The shape of the container is as shown in this image

*Use a servo motor (like tower pro, MG995, ) to push the plate in a controlled way.

* Use a separate source for powering the Bluetooth Module HC 05.

* For easy build, go for MIT app inventor 2.
* One can prefer other resources as per convenience.

This is a simple Line follower, And obstacle avoidance robot With a tray type structure mounted over it

Git Repository for software files