I didn't realize you were looking for kits, either, or I would have provided a good review for the Micro-Trains model. But you might have trouble tracking one down. I got BLW's last one last week.

(I don't think their online inventory is real-time.) I ordered two, got one.
The MT ice house and deck also appear to be getting scarce out there. I have one on the way from Fifer's, but I think it may have been his last one in stock (according to the web page).
I actually need a total of three decks for my scene. Joe at Micro-Trains offered to help me track down the third. There's a recent thread on TRW where I asked for help in that regard.
An experienced modeler with a chopper could probably roll his own. But I'm not an experienced modeler and I don't have a chopper. The deck extension I put together was actually my first kit. It looked a bit daunting at first, but it went together easily and turned out surprisingly well ... for a newb.
Good luck!
Jim