Hi Connor,

In fact, beams are the most efficient way to model a structure. Using mid-surface models is the second most efficient and using solids is the least efficient way to model a structure, in terms of minimizing node count.

You should replace the top and bottom rails with sheet bodies at the mid-surface. Just keep the Studs, which are meshing very efficiently.  However, the bottom rail is Fixed to ground, so just eliminate the bottom rail and connect the bottom of each Stud to ground either with a Fixed Support, or a Beam!