Anyway seems easy enough and will allow me to add to the test kit. So after checking the workshop components I will use the GQRP designs and the VU TX version and building a pair on tiny 4cm x 6cm prototyping boards I had been sent a while back.
The 2N3866 I'll use a GQRP club transistor (from 2006 (ish) Jan/G0BBL).
All transistors will be heat sinked as I expect this will be running 100% duty cycle for a bit.
Will probably not bother with the LPF as this will be used in testing not on air.
Photos and oscilloscope outputs to follow.