You need to convert the Gcode to x3g with this little tool:
http://www.thingiverse.com/thing:81425
This little program called GPX will do the trick, but it's a command line tool. It kind of works with defaults, I'm still tweaking with it though.
If the link is broken sometime in the future, this thing can be found on Github. I'll post more on that later probably, kind of hasty today.

The good thing is you can use it to print larger prints than the bed allows, but one head only Will have to refit the alu plate to allow this when I get the settings right.

edit:
You can refit the whole mobo with a Rambo or a Pololu or Rumba or something else from the Reprap project, they're like $200. Some calibration and tweaking and you can use Pronterface and Slic3r by default. May consider this mod in the future.