The constitutional scholar Dr. Mark McNaught, who is a Professor of Law, Philosophy, and US Civilization at the University of Rennes, is one of those who has been attempting to devise a draft constitution for an independent Scottish state.  Other groups and individuals have also been working on similar projects. This draft is not intended as the last word on a Scottish constitution, it is intended as a discussion document to help promote discussion and debate about the contents of a written Scottish constitution which is fit for the 21st century.  Within a few weeks Mark hopes to put this document on a Wiki style platform in order to allow all those who are interested to revise and add to this document with the aim of producing a truly crowd-sourced Scottish constitution.
https://weegingerdug.wordpress.com/2018/11/11/a-draft-constitution-for-the-scottish-state/