Built like a tank - powder-coated steel, plastic-capped uprights and footings, but all steel bolts/nuts. These will rust for sure, but will it matter if I set this up and leave it in place? I suppose I’ll get some rust staining underneath. Top cover is comparable to a thong on a person; doesn’t cover much and leaves you wondering why even bother? That’s all I’d improve. Btw, directions are inside hardware bag and are certainly adequate.