The “Remodel” mod is called ModelMeImpressed (GitHub). It is a server-side mod that lets you change the model of an object or creature using the Remodel menu option.

WARNING: Do not try to change colored creatures (pink, purple) into objects! It will crash the local area and any players who enter the zone. The only fix is for the admin to revert to a previous save or delete the offending object, which has to be done manually via the database.

What is okay:

• Objects to objects.
• Objects to creatures.