The positive reviews on hi-tech Apogee re-makes would convince me to start with $5K of NdFeB magnets and 1005 steel and DIY some 8' high dipole midrange and tweeter ribbons, plus construct a dipole line array of 15" woofers for bass....a better alternative to the Apogee single-end drive bass panels.DIY Class-A amps that can direct drive each ribbon without step-up transformers.
Ultimate 3-way Dipole Linesource