My MB339 is not the Cermark or D&L, it is about 1/3 larger than those models. I am fairly certain that it started out as a Italian Z-models kit (mine came from secondary supplier who the censored the labeling on the plans).
The kit was designed for a Gleikauf (sp) fan, and as designed is not at all suitable for turbine power. I had to redesign every bit of the structure to make it strong enough for my P-120.
Mine flys very well, but I would not recommend the kit at all.

This is it with paint:
I should be getting the graphics for it any day now, then maybe I will get off my butt and finally finish it so I can fly it again.