Building a peer to peer market place? Is it possible really possible?

Hi WordPress experts,

I have a quick question to see if the following is possible on WordPress or if I should opt for a custom site to be built:

1. Create a peer to peer marketplace or would I have to create a multi vendor marketplace
2. Allowing both buyer and seller to communicate amongst themselves in a chat bubble
3. Having an option to “negotiate offers” in chat (between buyer and seller)
4. Have the option to schedule meetings between buyer and seller

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Thanks in advance for the insight