Just throwing an idea out there: Instead of re-inventing the proverbial wheeled base, I wonder if it would make sense to build on top of some established wheel bases, like the turtlebot (https://www.turtlebot.com/). And then go ahead and build an array of manipulator/grasper options on top.
It’ll get you an established supply chain (including of replacement parts) and let you focus in on your specialty here: the reconfigurable agentic behavior stack.
It would be a no-brainer for me to jump on this and start building if the base was a turtlebot!