There is not very much to report. The PCB has the known quality from Michael. It is much mechanical work to do, drill all the threads into the alu case.
The transistors must have a appropriate depression, to connect the Gate and Drain leads without bending them up or down to the PCB.

Idle currents are:
FLM0910-4C: 1100 mA
FLM0910-8C: 2200 mA

With a very little tuning at the input, the output power is:
8 W, powergain is abt 14dB.