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I'm looking for dunk tank plans, especially portable ones. Can anyone help? - plans for building a dunk tank

I'm just looking for plans that are easily a plunge pool. I have some old supporters to change, you can use for the transport and the know-how to weld and build things. I do not have much luck finding the shots and I did not spend an arm and a leg structure either. If anyone out there know of the plans, which are highly valued. I want the bomb, "sink" any kind so please do not send me this link. Thank you very much. I am an engineer, but I want something that already works, and then from there. I will not reinvent the wheel if necessary.