It was supposed to be build point to point because most people would have chosen the caps in different flavours and sizes depending on personal preferences or availability...so a pcb or kit most likely wouldn't have any advantage.
If I remember it right, Dave used the Toko inductors that can be found on the net and partly Solen type caps for the bigger sizes...
I don't know if Dave ever thought sincerely of making it a finished commercial product....if he would have done it, it surely would be a nice one...
Kind regards,
Martin