Register -> Add Options -> Options Determine Cost of Event --> Pay

I would like to create an event registration workflow that look like this:

1. Register for the event
2. Select options that pertain to the event -- These options will represent different costs for the event - So the total price of the event will depend on what options a user selects
3. Click the add registration to cart button
4. Go through the checkout process and pay for the event.

I saw the following ideas that may work:
https://www.drupal.org/node/2704965
https://www.drupal.org/node/2659186
https://www.drupal.org/node/2559229

I would love some advice on how to implement this idea - Has anyone sucessfully done something like it? Any pointers for sending me in the right direction?

Thanks