I skimmed though, not a bad idea- instead of using a reverse proxy, you are basically doing a poor man multicast, by letting many servers answer a request. And instead of rewriting the packets, you encapsulate, which should be lighter and faster.

It might be a little more resilient than even a very minimal nginx, but more than that, I think it must give you more control about what happens when a packet is not "answered" after some set amount of time - you write off who should have been the answerer, then resend that same packet to another server. Keep a buffer of packet, scrape them from the buffer when ACK'ed by the answerer, resend them to another answerer if not ACK'ed after some set amount of time.

Am I guessing correctly?

It seems a bit overcomplicated for normal usecases, but adequate for a large scale like google.