Building the Hummerbot 4.0 with my son was a lot of fun 🙂 The building instructions and some reference code. The building instructions come as a video file, which is not a bad idea per se, however since it it based on renderings, not all steps are quite clear or do-able. I ordered the kit at http://wish.com (Voucher Code xcdswvt) and it arrived within some week.
The next steps will be going through the extensive sensor manual and build an abstraction layer for further playing. I will blog about it.