A lengthy article on 'dead bug', or as some same ugly style, albeit the author did manage to make his boards reasonably tidy.
RF being injected into the fets isnt your main concern if your worried about rfi, its more ringing of the coil and ringing of the stray inductance/capacitance around the fet, allthough heavy wiring and a pcb acting as a ground plane will improve things.
If you place a cap accross the primary to make the circuit resonant at the '2525' switching freq rfi will be much reduced, as will current draw.