The Ellis UK setup sheet should have been included in the kit, if you follow this exactly you should be pretty much bang on, all the team guys use this setup pretty much everywhere.
One thing to pay special attention to is the weights, a big part of the X-6 squared setup is getting the weight up and getting weights in the correct area of the car to give a good balanced setup.
If you bought the car new then you should have all this info in your kit, otherwise you will find it on the 'Tech' page of the X-factory site or on Petitrc.com as Arno suggests