In the numerical simulations, convection is initiated by inserting a mesoscale cold pool into a model environment defined by a typical pre-MCS thermodynamic sounding with a wind profile from archetypal LS MCSs. As in previously published modeling studies, the comparative strengths of the surface cold pool and the opposing low-level shear determine the rate at which a simulated convective system evolves toward a long-lived, rearward-sloping mesoscale updraft with attendant trailing stratiform precipitation. There exists in the model an optimal state in which upright convection above the nose of the cold pool is periodic, and the resultant system is quasi-steady, yet in which line-perpendicular storm-relative flow aloft advects hydrometeors toward the leading (inflow) side of the convective line. This structure has been the subject of some conjecture because inflowing air passes through pre-line precipitation before arriving at the system's convective line. The authors will present the kinematic structure of the MCS in this optimal simulation and the MCS's general effects on its environment, describing in particular the source of and modification to the system's inflowing air. Currently, the authors are also testing the simulated MCS's sensitivity to the wind and thermal profiles of the initial condition, and will comment on these results in their proposed presentation and extended pre-print abstract.