Interesting mix of TIG welding, brazed lug, and brazed diagonals, the latter indicating more BF NWT (probably Pocket Rocket with the 451 wheels) than Diamond Llama or All-Packa like the Trail Blaze.

BF currently powder coats, which can be thick and tough, but often thin at sharp edges, and nothing inside. It would be a plus if TQIQT phosphates, then does a dip paint and bake, probably would be spray due to varying colors, but an electro-deposition spray and bake will still be a tough paint, just no paint on the inside. Consumers doing a buildup can spray in various oils or coatings to protect the inside. Phosphate and a good baked enamel would have well over 1000+ hours salt spray, cyclic corrosion (wet/dry/wet etc.), and stone chip (gravelometer) resistance.