A very simple nintex form that is fired from a hijacked "delete this site" link on any site collection or subsite:
When the delete this site link is clicked, the user is sent to the form with the parameters passed in the URL of site url and the information asset owner for the site.
Upon submission, a workflow requests approval for deletion from the Information Asset Owner.
If approved the site is deleted.
If rejected the requester is notified of the rejection reasons.
Out of interest I ran through the basics again, and they are super helpful to anyone just getting started with Nintex Forms. Have bookmarked them to send to users within our organisation as very helpful material: