Tues-Fri after 6 works for me as long as I have enough time to schedule it ahead. 

@Larry Fried Thanks Larry.

Think about it, you are going to get moisture penetration so do you want to block it from escaping with a piece of plastic and then put a nice paper backed sponge in between to hold that water around your wood framing?

The way I handled showing was to tell everyone that there is an open house Fri and sat!

They sell a big box of the plastic ones for not too much at the box stores.

@Larry Fried Thank you for the warm welcome. 

You said "blue boxes" so it's plastic junction boxes and they are typically installed say 1/2" proud of the stud face, the rotozip would need to hit the OUTSIDE of the blue box and go all the way around. 

And DO NOT let them put in an above ground pool either (unless it's one of the $20 plastic ones from Walmart). 

I've also just learned about inserting a new plastic pipe inside the main and epoxy lining all the pipes.

Am I jumping from the frying pan into the fire?