Quick update:
Alan (Biggles) kindly sent me a dead OM345 to dissect. I've just started scraping away at it and I'm actually quite excited
It 'does' have little printed inductors on the PCB and they look to be in the same place I put them on my EM simulation.
I was so pleased when I saw the little meandering traces on the PCB because that is exactly what I had to do on the Sonnet EM simulation to perk up the gain at 500-1000MHz.
The only downside (on my simulation) was that adding these did compromise the K factor meaning the simulation indicated the layout wasn't unconditionally stable up around 1500-2000MHz.
I also ordered some contenders for the active device from Farnell so over the next week or so I'll see if I can replicate the original circuit.
It's really difficult to chip away the coating on the OM345 and I may end up trashing this one. I'm worried I'm going to destroy the delicate film resistors.