That sounds interesting a few years ago I worked on a project (the back end system that managed large chunks of the core UK internet infrastructure ).

That had an extended 9 month design phase - but a short 12 week agile sprint phase that delivered two intermediate POC versions and then a final working project (we even delivered hardware when at the last minute the customer admitted they hadn't ordered a server) - we even took enough networking gear that we could have installed a net work if that was missing to.