A custom template for Q&A plugin

Hello. I have the Q&A installed and I intend to run it on WordPress as a stand-alone Q&A website with no other activities (blog posts, etc.). I want to order a custom template for the Q&A plugin. My question is what template files do I need to ask the designer to design? For example, the default WP template comes with all these template files (more below the files list):
404 Template
(404.php)
Archives
(archive.php)
Author Template
(author.php)
Category Template
(category.php)
Comments
(comments.php)
content-aside.php
content-image.php
content-link.php
content-none.php
content-page.php
content-quote.php
content-status.php
content.php
Footer
(footer.php)
Theme Functions
(functions.php)
Header
(header.php)
Image Attachment Template
(image.php)
custom-header.php
Main Index Template
(index.php)
Front Page Template Page Template
(page-templates/front-page.php)
Full-width Page Template, No Sidebar Page Template
(page-templates/full-width.php)
Page Template
(page.php)
Search Results
(search.php)
sidebar-front.php
Sidebar
(sidebar.php)
Single Post
(single.php)
Tag Template
(tag.php)
Styles
Stylesheet
(style.css)
Visual Editor RTL Stylesheet
(editor-style-rtl.css)
Visual Editor Stylesheet
(editor-style.css)
RTL Stylesheet
(rtl.css)

I want a completely custom template with even a custom login/create account page, a custom member profile page, etc. I don't want my users to ever notice that they are on a WP platform website.

Thank you in advance!