Sandblasting is a huge PITA. The sharp grit will get into everything and you will need personal protection for your lungs body and eyes. A large air compressor will also be required like the ones used by roadway construction gangs. Try getting a quote from an outfit that paints construction equipment, or just paint it with a brush. Treat rusty areas with descaling needles, wire brush and phosphate. Your customers will only see it from a distance. Your objective is to clean it up with uniform color.