  We derive local $C^{2}$ estimates for complete non-compact translating
solitons of the Gauss curvature flow in $\mathbb{R}^3$ which are graphs over a
convex domain $\Omega$. This is closely is related to deriving local $C^{1,1}$
estimates for the degenerate Monge-Amp\'ere equation. As a result, given a
weakly convex bounded domain $\Omega$, we establish the existence of a
$C^{1,1}_{\text{loc}}$ translating soliton. In particular, when the boundary
$\partial \Omega$ has a line segment, we show the existence of flat sides of
the translator from a local a'priori non-degeneracy estimate near the
free-boundary.
