What "cheated" That's my tub!
I love it Doc, You better give me one so I can sell them here for you in Northern Minnesota. Lets come up with an insulated design though. Double walled, foam filled. With an insulated but vented heater, plumbing assembly. Probaly have to use a plastic liner (I know, I know) but in order to keep water out of the foam cause you know the customer will abuse it, let it dry out and it will leak. We'll use a brown (redwood colored) liner.
I got ideas bouncing around again someone hit me in the head!!