So when you drilled down you would drill to a map? Have you thoughts about creating a custom HTML resource?
Well you would drill down into a map if the content of the cell was a map object, if you clicked on the figure in the 24 Hour Availability you would potentially get a graph that represented availability over the 24 hour period.
Custom HTML sounds like a lot of coding that would need to be done and i would still probably only manage to produce a table with my little to no webprog experience however the elements within the cells would be the difficult part, map element easier, availability and counts more difficult.(well for me)
Its all good having the ability to make good looking summary pages with nice graphics etc however management are interested in the overall health and availability of services / information systems as a whole. A map status colour isnt really worth a thousand words and sometimes needs complementary information to inform the user if it is worth drilling down further.