http://www.patrickmin.com/minecraft/
I use these programs to convert model files into voxelated models. The viewer also auto removes any voxels which are not necessary structurally (i.e. internal voxels) so it's very efficient. In addition you can adjust resolution so the images I showed were really intense, high resolution, I think the space shuttle for example was 55,000 blocks total and that's including the removal of internal blocks. The viewer allows you view only a horizontal slice too so it simplifies the process by giving you a layer at a time, very easy to build a layer at a time. If anyone is really interested and unable to figure it out I can help you out, but if you just post a model file I can convert it and hook you up with a .bat script to automatically view the model and it's blueprints.
Maybe when I have some free time I'll log on and make one of these.
XI Wiki




