I so need advice!

Northern California, CA(Zone 9b)

I want to make 3 - 3 ft tall, 2 ft wide, 3 to 4 feet long hypertufa troughs for my succulents. I have been trying to find forms to use. I could find a big enough tupperware like container but not another that would fit inside with 2 inches difference. Would 2 inch Styrofoam work? I was thinking I could add to the height and width by taping more on with electrical tape. Would that be strong enough?

For something so big, should I make the walls 3 inches across?

Has anyone made such big ones?

Thanks for any wisdom you can share with me on these. This would be my first try with this.

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