Gino,
I think since he's modeling an early B model, there is some leeway on the color of the footrests. For instance on this early B model at Rucker:
Collectives definitely shouldn't be all black on a early B model. However, as the cork on the collective weathers, it definitely losses that nice new cork color:
You could also add the black area behind the cockpit seen here. This scheme was pretty common on early B models.
Gino is correct about the seat mounts. Later armored seats were mostly OD green with OD mounts, but the early seats and mounts would have been all gray. Looking good so far. keep up the good work.
Ray