Report as inappropriate

Hello, to begin, I wanted to congratulate you for your amazing work. And I have a few questions,
in your documentation, you talk about two different shields for the motors (the big blue one and the small red one). For the project with the IR sensor, is it okay if i use only the small red one ?
And also, do you think that a raspberry would fit in the robot ? Or should I modify the design ? Because I wanted to add some features to the robot