Two examples here
I have the content types (Collections) set up nicely in the admin dashboard… custom-coded all these, but you probably could use a plugin
As you can see, the login page is seamless Login | SquareRooms
Also register page with additional custom fields, and mailchimp subscription integration Login | SquareRooms
Registration is mostly for contest/giveaway participation, users also get to have their details auto-filled in such forms Win | SquareRooms
I have pinegrow but I didn’t see any need to use it yet when you can just do it manually by hand if you know what to do and how to do it.
With Pinegrow, you probably also need to have some knowledge of PHP. Read this A new easy way to convert Webflow to Wordpress - #14 by Diu