Just thought I'd upload some more pictures of this mod for anyone else wanting to try it.
I ended up using a 2n5484 because that's all I could get my hands on. It worked really well, it boosts the pedal to a much more usable level, works especially well in conjunction with the c11 mod.
I felt the c11 mod on its own altered the tone of the pedal (sounded like it cut out some bass or something), but with this pre-amp mod the pedal sounds awesome.
This was my first time using expressPCB and SCH, hope it is all clear and makes sense.
I definatley recommend this mod to anyone who owns a Blue Box!
I really like the tone with both output and blend at 3 o'clock, or for even louder craziness push the output to full.
Will try upload some sound clips/videos sometime in the future if i get around to it.