  We derive covariant wave functions for hadrons composed of two constituents
for arbitrary Lorentz boosts. Focussing explicitly on baryons as quark-diquark
systems, we reduce their manifestly covariant Bethe-Salpeter equation to
covariant 3-dimensional forms by projecting on the relative quark-diquark
energy. Guided by a phenomenological multi gluon exchange representation of
covariant confining kernels, we derive explicit solutions for harmonic
confinement and for the MIT Bag Model. We briefly sketch implications of
breaking the spherical symmetry of the ground state and the transition from the
instant form to the light cone via the infinite momentum frame.
