SJN, the weird thing is that our planes have different mounting systems, the DF mount on mine and the JHH one I had is right behind the intake ducting, or right in the "front" part of the hatch area, and the mounts that I have my turbine mounted on I installed them myself in the fusalage they are part of the turbine installation kit from JHH. Yours appears to be factory ready for a turbine! From what I recall it was fairly centered with the fuse, but I would be more concerned with the centering on the turbine thrust tube, mine is just about perfectly centered with the turbine tube. I would say test fit everything first including the turbine thrust tube before shimming just to see. Please keep us posted and I'll do the same.

Michael