Users will also not allowed to edit their posts
Good luck with that, should that be enforced. Another hobby forum i am part of attempted this and it was a disaster - unnecessary multiple posts to update info on their thread (for example, dead links) due to the inability to edit their posts.
I do not know if SMF supports the ability to batch delete posts by a single user (with a single click).
If you do decide to enforce the edit post rule, there should be a timer that the user can edit their post before they are unable to. Usually 30 minutes is enough for revisions after a post is made. Just prepare to deal with multiple posts for a single reply/post update.