It's the Anigrand resin kit. I believe they only made 200 of them quite a while back. Believe me, you don't wanna know what those things are selling for...
The scale is quite impressive: 1/2256. It scales out at 71cm x 46cm.
MY LHS' owner is going to help me out a bit with constructing a sturdy base and getting all the resin parts cleaned up and bent back to their correct shape. Hhe has far more experience than me in that regard...
Here's a link to a pretty nice looking build of it:
www.therpf.com/.../anigrand-star-destroyer-122027