Django Design Pattern for Large complex web app

See:

I have personally fallen in love with HTMX and wouldn’t even think of starting a project now without it.

I don’t think I’ve ever used raw SQL for a Django model. We use the ORM exclusively.

Do not confuse a Django Form with an HTML <form>. You can render multiple Django Forms within a single HTML <form> tag. See Prefixes for forms.

I’m sorry, I don’t understand what you’re trying to say here.
(You do need to check authorization on each view. It doesn’t make sense in Django to do anything else.)