I just wrote you a reply to your email a minute ago, but to answer some of your questions here as well...
We are still launching the laser attachment. I know it has taken longer than expected, but we went a little farther with it than we had initially planned. The attachemtn will be compatible with both Arduino and Mach3, however we are working on some software that will be compatible with our Arduino controller only. This does not mean all is lost as there is already tutorials for using the laser with Mach3 available for either cutting or engraving images. We will make sure all of this gets spelled out at the time of launch. It should not be a very difficult process, and if you were able to succesfully get your CNC running, you shouldn't have a problem adding the laser. We are always here to help too, so don't worry.
As for the Aluminum Gantry for your 12x12 we o still have them available and they can be found here: (assuming you have our standard "milling" height gantry and not the 3d version)http://www.zentoolworks.com/product_inf ... cts_id=262