1/48 Accurate Miniatures B-25C
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The lower turret is somewhat difficult to put together because the guns and the pin that attaches them to the vertical shaft are joined by a strap that must be bent to get the
proper geometry as they are assembled to the shaft. Arriving at the proper spacing to fit the turret while the guns are parallel without breaking the strap was a challenge. 
I also found that the turret does not move far enough up into the fuselage in the retracted position when the guns meet the top of their troughs compared to photos. 
There is a lot of great detail in the model and the parts fit very well.  There is a fair amount of test fitting to find all the correct placements and sub-asemblies must be
built very carefully to insure that minor missalignments don't spoil later fits.