Yes, both the hosting bundle and the .NET SDK have been installed and are working as I have been able to create and run a new project on the server in the same directory - the project has since been deleted and it is reverted back to the uploaded files from my own machine.
It seems similar issue to this post (Path /umbraco is not working after deployment on IIS, any CSS or other resource returns 404 Not found - #9 by justin-nevitech) except that I am not running both a localhost and IIS website at the same time - only the IIS version.
Looking at the debug console in Chrome, it is only the script files from the importmap area of the page that are not working - {imports ..}, stylesheet files and any linked JavaScript file (e.g. apps/app/app.element.js) are being found and served correctly.
It’s as if there is something not configured that recognises the GUID element of the URL that is being generated for the import map script, but is working for anything that has a HREF attribute.
All the files are correctly located in wwwroot/umbraco/backoffice etc, they’re just not being served by IIS for some reason-- probably really stupid (by me) and really simple to solve 