The output jack is on the side in those PB-30Ms, so you don't need to make an extra hole if you modify the pearloid scratchplate you've got (well it should be on the side, but I know someone got a kit without a side hole drilled for them). You just need to cut the scratchplate plate down to fit.
The output jack is shown on the front in the kit photo: Kit photo LINK

Simon's advice on shaping the pickguard and extending the routing is solid though.

This kit is very similar to the SX short scale bass I own, including the jack on the front. Not my favourite location, but I'm not a bass player so I just keep it as is.