Let us assume that we have a project called TheProject, so

Create Data Model

Create subfolder for the project

Similarly to Kohainfo, TARA etc.

Create collections

Can a project manager do it or should it be done by a dedicated person?

Associate data with other tables

Users should have access to associated tables, otherwise they wont see those connections.

Create user roles

The roles you should have are TheProject administrator (you should be included) TheProject data manager TheProject viewer (in case the project is not ready)

Assign role and policies to tables

Create policies that allow required access to specific tables that are required for users. For your project add policy and also create a role for user who in ARHUT system just for the given project.

Assign role rights to users