  We report progress on the development of Perturbative Integral Representation
Ans\"atze to compute the nucleon Faddeev Wave function, using an explicit
quark-diquark picture. Our formalism is able to handle non-pointlike diquark
and to mimic the strong, dynamical correlations observed when solving the
Faddeev Equation. We then project the wave function in order to compute the
leading-twist Parton Distribution Amplitude.
