It's really amazing what you can do in a spreadsheet.
Several years ago I was involved with management of optical wavelength switching gear (DWDM) in conjunction with a large, national telcom. They had some very well designed tools with very nice GUIs to allow things like building an optical path. Things that require managing complex database and doing a lot of checking on availability of resources and validity of the circuit.
It was all written in Excel!
I was amazed at it all. Nothing looked at all like a spreadsheet. and it actually worked and seemed pretty maintainable. I'm sure that they would have been delighted to see this sort of things as the one issue was the time it took to update the screen when certain changes were made (re-calculation).