Brace across middle, 3/4" to 1" plywood on top of the stand, 3/4" rigid pink insulation foam on that then tank. Whatever you skin the tank stand with would go up maybe an inch over the bottom of the tank to hide all the layers.
Make sure you paint your stand with a really good anti-corrosion paint. Some people also weld in adjustable steel feet to help with levelling. Although shims can do the same thing.
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