Thanks guys - I've ordered a bunch of replacement stainless steel screws for everything. I wasn't planning to try do anything fancy - best practice is good enough for me .

I put the ferrules in and clamped the neck in to make sure the bridge is still in the right place. The strings run over the pickups okay when they're mounted in the new pick guard so that all seems good. I noticed there is still very small gap (0.5mm) at the front of the neck pocket (I thought I'd fixed that) - should I attempt to fix this?

While I was shopping I also got some gotoh strap buttons and a jack plate... and with that I think the only PB parts left for the guitar are the nut (bone upgrade) and tuners (Grover upgrade).

On the subject of nuts... I bought a couple of Graphtec Tusq XL pre cut nuts with the intention of using one of them this guitar. But comparing it to the nut supplied with the kit the string spacing is different. The XL spacing is the same as a strat/tele (35.05mm). I did a bit of digging around but couldn't find anything that documents what the PB nut spacing is. (I guess I could measure it - duh). I assume this needs to match up with the spacing of the tuners so that the strings travel as straight as possible?