I'd live on site - much easier travelwise, means your DH can be 'available' more hours, but not necessarily be at the workshop, KWIM?? Plus everything you'd save on fuel.

I didn't like the 'stay at PIL' idea, because you're gonna be stressed to the max with the new business - do you really wanna add to that the stress of living with a 'neat freak MIL'??

GL hun