Question about making a tiered planter out of stainless steel

I am thinking about making a tiered planter out of 4 stainless steel -The bowls are shallow and range in size from 12 inches to 14 inches to 16 to 18 inches in diameter. I'm thinking I'll use 3 or 4 inch PVC pipe between the bowls and anchor them with 1/2 rebar. Maybe fill in the spaces with pea gravel. Would this work?

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