It is helpful for me to get a layout visual which I sometimes print out and pin up while developing the layout for site modules/content. Using the default Joomla ?tp=1 is not always a very good visual and by default I block this anyway via Admin Tools.
So I like to use a bootstrap relative grid. Could you please confirm that this is accurate and if so, maybe it will be useful to others. If not let me know and I will update it accordingly. This is for the web view. tablet and mobile view would be the next steps.