Which Kit should I choose?

I want to build a driving roboter which I can modify later on, for example like attaching a pen and build something so I can mark the ground with this pen when ever I want. The measurements from this robot should be around 35cm x 35x 10cm. Could you guys recommend a roboter kit that I could buy only for the robot and which has parts so that I could build something with these measurements?

submitted by /u/Sentrinity
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