It's not open anymore as it was only open for a couple of days in September and then October for Halloween.
I haven't looked into the silent Hill maze but last year they did Saw and it looked ****ing AMAZING. If Thorpe can do at least half the detail they went into then it'll be a great attraction.
Go to their site and click on the 'media' tab to see some images from inside. The level of detail is staggering.
http://www.sinisterpointe.com/
There's videos on Youtube on it that show inside it as well.
As for the Silent Hill attraction I haven't heard or seen much about it. There probably will be soon now that Halloween has just finished.
Edit: Just found a video of the Silent Hill maze as well.
Shows some footage from inside it as well.
[youtube]http://www.youtube.com/watch?v=CcKPCBTnUaM&feature=related[/youtube]