What is the max weight you can treat as an improvised throwing weapon?

[Zhorn]

RAW, you can't use another creature as improvised weapon, as improvised weapon rules specifically refer to objects.

... in part I want to agree with the notion that you shouldn't be able to use living opponents as improvised weapons, but technically you can use a creature's body as an improvised weapon RAW.

An improvised weapon includes any object you can wield in one or two hands, such as broken glass, a table leg, a frying pan, a wagon wheel, or a dead goblin.

You can go by a strict rules as written interpretation that if you are using a creature as a weapon it must be both dead and a goblin, but I'd think in the spirit of the rules, this line in the book does open the door to using any creature as a weapon assuming you're able to lift and swing it around

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And if you can swing it, throwing it should also be possible.