So I was looking around the knp website - I'm not convinced I'll actually get the printer I won, but I did find a gcode to x3g convertor. Which if nothing else proves the knp is a standard makerbot clone.
http://knp3d.com/software/#knp3dconverter

I presume it's a gpx hack. But it's what knp use to convert slic3r files to x3g. Has to be worth a try right :-)
if it'll take any gcode file from any slicer tht'd be even better.
Might be worth downloading slic3r off the knp website as well, as they might have added some custom profiles.
I'll try it later, no time now.