Here's another thing, my first attempt at a tower. The columns on the second level are a little too close together but it still comes out pretty nice. It is just under 130mm tall so it should be possible on a MakerBot. A large size is also included, in case you're feeling ambitious!
Regular 60.0mm x 52.7mm x 129.7mm tall
Large 84.0mm x 73.7mm x 181.5mm tall