I don't know about the size, I'd say anywhere from 8-10 inches tall? If you could make something like that, awesome.
Also here are dimensions of a couple of things that I have -

The Turbo Laser is something Owen is working on right now, measurements will most likely be about 7 inches x 7 inches for width and length - height, anywhere from 12 inches to 18 inches.
For the Imperial Tower, is is shaped more or less like a triangle. So I measured the length of each of the sides - approximately 13 inches on each side.