WHACK! (smack upside my head)
Steven, what a neat idea! The mobile control subsystem, moves to the (various) machine(s).
Careful working the connections - they'll become the potential failure point from multiple use.
Also. it seems smart to "preplan improvement" if you know you're gonna want a bigger machine. Might even size some other componentd for reuse too.
Welcome... to the Machine!
Jim