I built the PA board for this when I was a foundation licencee, but under the foundation licence, you must only use comercially made transmitters. Since getting my intermediate licence, I have put it in a box, and added an RF sensing switch so I can use it. It uses a 2N6084 RF transistor, and will produce 50w output max. It is a class C amplifier design, and therefore good for FM mode only. I have tried using the 2N6084 in class A, but amplifier gain was down to about 4dB and it seemed a but pointless!
Some people requested a schematic of the PA board, so I drew one up.