Is it me or did the net hashrate and difficulty double?

If the dev could find a zoo or similar, somewhere with a breeding program, which has a new/recently born Rhino, it really could help amplify the story with the "aww" effect. The amount of money raised from this initial drive would only be relatively small (due to early exchange prices), but would still have an impact for a single site like a zoo or safari park (rather than one of the giant charities). It could still be a high profile story if its one of those in a major world city, you had the cuteness/heartwarming factor sorted, etc

Have you thought about starting a "Rhinofund", and accepting donations to a specific wallet address? Once Rhino is trading and has a value, you could cash in the fund and distribute the revenue to Rhino charities. If it feels like a solid enough donation, it could easily be used to get some good press and increase awareness of the coin.

Asking Warren Buffett what he thinks of Bitcoin is like asking your great grandfather to help you choose a new laptop.

How many more blocks of CPU mining are there?

Fantastic, a coin that has real purpose, will be getting set up to mine some of this.