I just completed the prototype of a mini Z power bed for the small engraving machine. See my Youtube posted at http://www.lightobject.info/viewtopic.php?f=61&t=1232
In the beginning, I'll get 5~10 unit before full production and it should be available in about 2 weeks. Early bird is welcome! The unit comes as a kit. It should take 45~50min or less to assembly it. Note, there is no driver or controller included but available on my site. It come with a a 42 series stepping motor capable to left 5lb object. You may want to change the focus lens to 38.5mm to take the advantage of full extension.