My solar concentrator design gets about 65 W/kg, at a lower cost than PV cells, before any power is beamed wirelessly.

This reference, indicates that is is competitive with current end-of-life specific power of PV panels used on the space station and on communication satellites, although the paper speculates a factor of 2 or 3 increase in specific power for PV cells... well, I speculate a factor of 100 cost reduction for mirrors! :-)

At this point it's all speculative, and I wouldn't publish in JBIS until I analyze every aspect, including electrodynamic propulsion, which I currently assume at 100 percent efficiency. Obviously it won't be.