I think you are on to something …
As a computer science guy, I won’t even try to hide that I like information systems 
Together with @Natalia_Skoczylas and the rest of the Future Makers Nepal team, we had some own ideas into this direction: a Humanitarian Data Information System (for UN, government etc.) and a phone hotline interface for this. See the very end of this document.
However, your proposal is even more encompassing! I like your idea of integrating volunteer coordination. Volunteers could even have their CV saved there and apply for positions online with just a few clicks. Also, seeing an overall progress of reconstruction in Nepal would be awesome. And then, the cherry on top: beyond reconstruction, the same information system could manage infrastructure development for rural Nepal. (You know, all the things that were not destroyed by the earthquake because they were delayed … .)
What I’m currently struggling with, though, is how to get this information system (1) developed and (2) accepted. See my post on movement building, which I wrote during a low point in the last days. Constructive input and ideas welcome