  We construct a $\wedge$-homogeneous universal simple matroid of rank $3$,
i.e. a countable simple rank~$3$ matroid $M_*$ which $\wedge$-embeds every
finite simple rank $3$ matroid, and such that every isomorphism between finite
$\wedge$-subgeometries of $M_*$ extends to an automorphism of $M_*$. We also
construct a $\wedge$-homogeneous matroid $M_*(P)$ which is universal for the
class of finite simple rank $3$ matroids omitting a given finite projective
plane $P$. We then prove that these structures are not $\aleph_0$-categorical,
they have the independence property, they admit a stationary independence
relation, and that their automorphism group embeds the symmetric group
$Sym(\omega)$. Finally, we use the free projective extension $F(M_*)$ of $M_*$
to conclude the existence of a countable projective plane embedding all the
finite simple matroids of rank $3$ and whose automorphism group contains
$Sym(\omega)$, in fact we show that $Aut(F(M_*)) \cong Aut(M_*)$.
