Thanks for the reply, sorry I’m so late in responding. After all the hoopla I have decided to go back to the method I always used, which is Homasote over plywood. When I contacted Lowes they would order the foam from South Carolina, and of course I would pay for shipping.
I have not been the The Happy Hobo, but have been to the Suncoast MRR Club several times on their open hoouse events.