Need native Japanese speaker to help with VN translation

Hi, Shion here. We're working away on the Higurashi no Naku Koro ni - Onikakushi sound novel translation project, but we could use a little help.

I was wondering if there were any native Japanese speakers on this board who might have time to help us out with some undocumented idioms and cultural references that we've had trouble finding information about, as well as maybe cross-checking some bits. Just to help us get Onikakushi finished up to be the best it can be. Oh, and it'd be a bonus if you know about mahjongg, since some talk about that comes up during Detective Ooishi's break-time, and I'm _really_ not an expert ^^;;. Please PM us if you would be willing to help us out. Yoroshiku onegai itashimasu!

Shion (Sonozaki Futago-tachi)