Not wrong about bridge PUP rout as it will take a stock Chinese PUP but when I tried to install Entwistle upgrades the 4 lugs for the adjustment screws were spread a little more outwards and this required a bit of reshaping to make things fit, both on the body and with the pick guard for the neck PUP.

If you are thinking about shifting the neck PUP (or middle in this case) the pre cut scratch plate tends to dictate where it should sit and you may need to order a blank so you can custom cut to suit.

DB might be able to add more than me but aren't PUP's supposed to be located somewhere near a naturally occurring harmonic or can you just plonk them anywhere?