Stress Management beyond pheromones (Feliway, etc)

[MandyCoonie]

In a previous post I discussed the work we've been having done on our house. That work started late last week and is ongoing today, they should be done by Monday.
We did not have to relocate, thankfully, but I had to keep the cats upstairs and out of the way of the workers. I kept a box and food and water in the room, only came home to a small puddle of cat barf yesterday- but it's clear that this is very stressful for all of them. Merlin is feeling much better and has been back to his pirate self, and this pirate is not pleased with the ongoing intrusion on his turf. He sprayed the wall in the basement family room right in front of myself and DH, in the same place where he has sometimes pooped. Mandy shows her unease in more subtle ways, but last night she silently jumped on the bed (she usually gives a "greeting chirp") and proceeded to bury her head in my shoulder, purring loudly. She's also been clinging to me like a koala bear when I hold her.
I guess I'm wondering what else we can do to help all of our kitties, and especially our sensitive Coonies recover from what has been a very stressful time for everyone. Ideas?