I recently tweaked the rolling colabsible casters that I put on an old Craftsman tablesaw. Here is the link if you want to see the latest updated video. https://youtu.be/EAHVO94Xhcg
That looks great! I’ve not seen that design before, though I’ve seen various retractable casters. I was just talking to a friend last week about a system like that. I’ll have to show him your video.