Really good!
One suggestion, if you don't mind, when you use romaji, italicize it with <em>ohayou</em>, _ohayou_, or *ohayou* for this result: ohayou. This makes it stand out from the English words and is grammatically proper. You see it a lot with Latin & Greek.

Glad to see someone doing this project. I thought about it, but realized I couldn't dedicate my time to it. By the way, check out @steemitjapan, which just started.