I just looked in the gallery tab and searched sleigh template. Here is one template.. http://cakecentral.com/gallery/1168877/
As for advice, I would cut all the pieces out of gumpaste and do any decorations that you are going to do on the sides and let them dry flat for a couple of days and then assemble with vanilla to act as glue. HTH! If not, feel free to ask me any questions, and I will try and help you!