  We report on recent progress in the development of Laue lenses for
applications in hard X/soft gamma-ray astronomy. Here we focus on the
realization of a sector of such a lens made of 11 bent Germanium crystals and
describe the technological challenges involved in their positioning and
alignment with adhesive-based bonding techniques. The accurate alignment and
the uniformity of the curvature of the crystals are critical for achieving
optimal X-ray focusing capabilities. We have assessed how the errors of
misalignment with respect to the main orientation angles of the crystals affect
the point spread function (PSF) of the image diffracted by a single sector. We
have corroborated these results with simulations carried out with our physical
model of the lens, based on a Monte Carlo ray-tracing technique, adopting the
geometrical configuration of the Laue sector, the observed assembly accuracy
and the measured curvatures of the crystals. An extrapolation of the
performances achieved on a single sector to an entire Laue lens based on this
model has shown that a PSF with half-power-diameter of 4.8 arcmin can be
achieved with current technology. This has the potential to lead to a
significant improvement in sensitivity of spectroscopic and polarimetric
observations in the 50-600 keV band
