If we take frankie as an example. If he where to eat the gum gum fruit, would his mechanical parts become rubber as well.

And if he ate a zoan type, would his arms transform into normal animal parts, metal animal parts, or just fall off and be replaced by animal parts.

If his metal parts arent affected ar all does that mean they are unaffected by all the weaknesses as well.

And if they are what happens if a part is replaced. Does the new part gain the ability and the old parts loses it. Or could you make a robot with devil fruit powers by attaching the parts to a cyborg with a df first.

Please tag potential plot spoiler so that those who aren't caught up can still read the answers (I'm currently at episode 663)