I don't see anything wrong in making your bike, car, whatever, your own, putting your stamp on it as it were.
If the bike is a ten a penny Chinese thing, do what you like, nothing is lost, but anything out of the ordinary or old, then you have a duty of care. customise it if you like, but make sure it is reversible, no cutting or drilling, and all standard parts removed should be saved. After all we are only custodians until the next owner takes over.
I suppose I am guilty of a bit of tweaking, but all parts swapped are saved and nothing is damaged.
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She keeps changing as time goes on, (the Venom exhaust is at the platers as we speak).