Of player models, official servers, and the workshop

This part:
What is the difference between ranked and unranked servers?
Ranked

Steam Inventory support: Yes
Player data is stored: On Steam Inventory, available across all Ranked servers
VAC: Required
Items earned are tagged as: Genuine
Unranked

You can mod it and add custom items
Steam Inventory support: No
Player data is stored: On unranked server’s file system, not available on other servers
VAC: Optional
Items earned are tagged as: Non-genuine
Both ranked and unranked will allow players to earn currency.

However, keep in mind this:

Your Condo…

can have both ranked and unranked items. Players will know the difference based on the items’ genuine status.
is completely separate from ranked and unranked servers and will be part of your Steam account no matter what Lobby you join.

My part:
I’d assume that custom player models would be like it says for unranked items, they’ll only be in that specific lobby, and maybe work in your own condo as well.