  Given a countable group $G$, we say that a metrizable flow $Y$ is
model-universal if by considering the various invariant measures on $Y$, we can
recover every free measure-preserving $G$-system up to isomorphism. Weiss has
constructed a minimal model-universal flow. In this note, we provide a new,
streamlined construction, allowing us to show that a minimal model-universal
flow is far from unique.
