I've heard back from the good folks at Kessil, and we may have a possibility for a Saturday tour. The Saturday possibilities I've been given are June 2, 9 or 16. There is going to be a bit of dependence on the person giving the tour, because the facility is closed on Saturdays, so it will be an extra work day for him. And, as I understand it, the facility will not be in production. The Fridays before what I've listed are also open, the facility will be in production, and there is a much greater chance of being able to arrange something.
If you're interested in this, please post the date you prefer, and I'll get back to Kessil to see if we can make it happen.
Thanks everyone!