RAK 7258 stand-alone remote monitoring

For temporary remote monitoring of environmental conditions during i.e. construction of buildings, I would like to use the 7258 in such a way that it stores the sensor data from the connected sensors to sd and shows this data in a nice dashboard with selectable historical graphs in a web-page, accessible with any webbrowser and connected to the internet through 4G LTE. So the internet-connection is only used to access the online dashboard (after login) of the 7258 when connected with 4G.
What would I need to make a nice custom dashboard/EUI (accessible for customers) for the embedded webserver? Can I find any examples anywhere?