In general, the robot chassis should be the easy part...
However, there is a lot to learn.... I once had a delightful argument that lasted 2 years... with a friend about how ultrasonic sensors inherently made better wind-speed indicators than obstacle sensors. However, since people see it as an easy solution, they fixate on these terrible sensors... and keep them in production.
Everyone starts with a turtle-bot design....
I often recommend people use a modified old/used roomba, as there is a lot you can do with a single cable ( http://blog.perquin.com/blog/category/roomba/
). Note, all standard parts can be replaced... which is convenient.
Small tracked vehicles are also prone to several issues with all the linkages, and tend to be overpriced for just the drive components.
So No... I would buy a used RC car/quad as a platform before spending days of my life to build something like this kit.