It's all do-able and, yes "short cables and no loss of signal" is what most of us believe (assuming one can hear the difference - I'm not sure I can).
BUT... the big problem I found with the PCB was the connector plugs you need on the pickup wires. So when you want to put different pickups in, they either have to come with the correct plugs - or you have to have the ability to get the correct plugs on to the wires. Don't know whether your guy is geared up for that? Could be, but after checking it out I decided I didn't want to invest in the tools and raw materials for doing that (I've bought several Gibsons since, and not one has a PCB in, so I feel kinda relieved I didn't bother now)
I had two options 1) Cut the plugs off the Gibson pickups and solder the BKP leads onto the wires coming out of the plug... 2) Rip the PCB out and stick it in a box/bag somewhere.
I did exactly the same as Agent Orange (again, not as neatly, Tom!) - and I've swapped pickups and caps etc two or three times in that particular guitar since then. LOADS of time, effort and money saved because I put the PCB somewhere else.
That's how it was for me, though. The main thing is getting the guitar working like you want. The PCB is a good idea... that didn't really work out for me!
