I love this set, but even before it came out I wanted to add some custom wagons to it to make it longer. Finally my Bricklink orders have come in (apart from glass for the windows, whoops!), and my train is ready for Christmas!
I've added five new carriages - a Hot Cocoa Tanker, a Passenger Car, a Present Wagon, a Reindeer Wagon, a Christmas Tree Wagon, and converted the original middle car into a Santa Wagon. The full imgur gallery can be found here - http://imgur.com/a/D135p
A bit of a late update too, haha, but I am selling the instructions over on eBay - https://www.ebay.co.uk/usr/mouseketeer111 :)