I have one!
Mine's virtually done, put the Saito 91 in it. It will need some nose weight, but not 1.5 lbs.
I a bit leary to fly it because of the weird incidences. With the horizontal stab level, all three wings seem to have about -2 degrees of incidence. The book doesn't indicate the desired incidence and GP hasn't returned my EMAIL on this matter.
Does anybody have any light to shed on this matter?