State of your current model is total garbage , I would not consider it useful or viable for any further manipulation I have million time better result with ct scan of the internet lol So you have few options: ask for better scan data /use different software to converting scan date to 3d model / have knowledge/ability how…
What’s the purpose and intended use for this model once your cleanup is complete? Filling in with cloned data is not going to match the real object anymore, so it won’t be reliable as a representation of the real thing, if that’s important in any way. If none of this matters, I would suggest converting the scan into a…