Yeah, I've bought and made some of the makerspet projects. Really like the quality, thought, and approach.
Good blog too with detailed how-to's, eg omniwheels:
I used/modded Nathan's STS3215 mount with TPU rollers for my LeKiwi (thanks Nathan, BTW!)
But, I was really wondering how flexible/versatile a base this might be or could become. What scales with size as Sergei suggests (or would need to) and what wouldn't or couldn't. Maybe it's time for a fully open source (hardware and software) TurtleBot 5 ;-)
- Ken