The steel holding to your antique wooden chair frame would definitely be a great idea for low-cost and durable furniture from reprocessing of pallets. Nothing is hidden and complicated in this motivating design of DIY pallet chair with steel legs. You can go with different creative berth and back to it by scaling them up and down and giving some twisted and sharp angles for sensational full of fashion appearing model.
The ravishing antique looks on wood has been given with stain and varnish to it. Nuts and bolts would be better choice for holding the structure up and firm grip by making the bolts tight to desired value. Vary the color of the legs that your creative mind thinks relevant and convenient.