WordPress Development Assistance for Adult Website

We have used the Salient theme to build a website and need to implement the following:

1. I would like to duplicate the custom post type Portfolio. Copying all functionality and naming this Models.

2. We would like to select what pages can be accessed by members only. When navigating these pages, there should be a two second delay before a pop up appears with a sign up/login form. The background should have a dark overlay.

The user then needs to enter their email address and verify it. This will create a user within WordPress and a password provided.

If they have kept the pre-existing window open, it will reload and they can see the content.

There is no payment, this is 100% free.

Possible plugins

https://pickplugins.com/user-verification/

https://pickplugins.com/restrict-user-access-alternatives/