To save $50 on struts you want to suspend 60-70 pounds of boiling liquid using ropes? Between the $30 for the hoist, the cash for the 2x4s, and miscellaneous connections, it doesn't sound like you'll save much if anything. Plus, let's not forget the swinging cauldron of molten beer. I love bootleg solutions as much as the next guy, but this sounds to me like a lot more trouble than it's worth. That said, don't let me stop you.