Mini cookie cutters

Mini Cookie Cutters; approximately 30mm, 22.5mm and 15mm.
There is only one size of the trains - about 30mm

These are to make tiny gingerbread cookies which are going to be used be decorate our entry for the 2015 GingerBread Jubilee fundraiser. This will be our 5th year in a row with at least 2 entries. http://www.craterian.org/support-us/gingerbread-jubilee/
https://www.youtube.com/watch?v=y6aOlHvgc9I
I tried to keep the wall thickness at .8mm so they would all have two layered walls for