In his own words:
This PA board is so GOOD that it will be made available also as a standalone 10W HF Linear PA kit. It is ready for production and should be the first of the QSX modules ready for sale.
The requirement for expensive Mitsubishi RD16HHF1 etc transistors in a decent amp is an absolute misconception. In reality they are very very expensive and not necessary in HF applications such as this.