Fiberglass filled "reflex" boxes -driver pick ? (VMPS style)

The late Brian Cheney, at least with his early VMPS offerings, typically put two polycone woofers of dissimilar T-S, driver diameter, in a tall tower, pretty much filled the cabinet with fiberglass. There was a floor facing Morite weighted passive radiator at the bottom of the tower and that PR fired out a slot whose area, which IIRC, was smaller than the PR's Sd. There was no filter on the paralleled woofers (could have used one with the Super Tower 2).

This didn't seem to be such a bad way to approach some loudspeakers - other than eventual PR sag.

Are there good fudges for 2 dissimilar woofers and a slot loaded passive radiator in hornresp?