I thought you were rich. Head on down to Spa Heaven and get a nice one delivered. What you have in mind won't work. No insulation, no pump, no filters, no cover, no jets, no steps, no seats, no lights, no music. And it takes some BTU's to get that much water hot, even with insulation and a good cover. So give it up and spend some of that rich man money. Plus- you'll spend as much on that homemade crap set up as you would on a decent unit. You're 67. Time to start getting smart.