Hmm, that´s one heavy turbine. ;-) Since I´ve not built my Xcalibur yet.. but I do have read about it alot.. and I´ve noticed that you want to build the aircraft as light as possible. It is a small plane..
My T35 kolibri is 265grams so I´m gonna need a lot less of mass in the front to keep the CG, your turbine seems to weigh about 400grams more than mine.. so to keep your CG right I´ll guess that you´ll need to have alot of mass in your nose. Like batteries and such.
You might want to consider to use a lighter turbine.. If you read from the very beginning of this thread, it seems that a JetCat P20 would do just fine, even from grass.
But this are just guess work from my side.. but as a general a lighter airframe is always better ;-)