Or you could just start fresh and remake it. Its not like the voice acting was perfect the first time around.
I agree with that, as soon as Robert Hirschboeck will be part of it again, flash and blood (plenty of it

)
I'm afraid that a '7th guest' remake, without real video footage, deeply and smoothly filled in the CGI world of the manor, as it was in the original, could really lost a big part of the charming, creepy mood of the title.
You know: nowadays, we have so much good horror adventures games, totally in CGI graphics (I'm thinking of 'Dark Fall' trilogy, 'Scratches', 'Darkness within' and so on) that I really think a possible remake of the '7th guest' should use live actors to remain authentic to itself and also to be somehow different, compared to what is offering now the market.