A theme of its own
T-Builder 0.9.15 packages a converted page as a WordPress theme: one real Elementor widget class per section in plain PHP, with Content and Style controls, zipped or installed on the site.
Some agencies deliver a theme, not a page: one widget class per section, in PHP they can read, ship and keep. T-Builder 0.9.15 builds that from a converted page.
What you get
Every section becomes a real Elementor widget class with Content controls for each text, picture and link and Style controls for colours, fonts and spacing, the design as the defaults. Around them: a shared base class, a loader that registers the category and the widgets, functions.php, minimal templates and a canvas template, one scoped stylesheet per widget loaded only where the widget is used, the entrance animation script, the design's own font files, a demo page with every widget at its defaults, and a README that says where everything is.
How you get it
Ask for it in the project chat: "deliver this as a theme". T-Builder converts the page into section widgets, packages them, and gives you a zip to download, or installs and activates the theme on the site in the same step. The Elementor editor and the front end render the same PHP, so what you see while editing is what the site shows.
Update to 0.9.15 from your account, or let the plugin update itself.