You're a ways off needing to do this, but when the time comes, one way to achieve continuity between your pickup cavity shielding and common ground would be to run a wire from the neck pickup cavity through the pickup wire hole; through the hollow portion of the body then up through the pickup wire hole into the bridge pickup cavity. Solder the ends of the wire directly to the shielding tape in their respective cavities. You will also need a separate wire from either cavity connected to wherever you have your common ground.

And don't forget you will also need to ground one of the posts for the wrap-around bridge. I don't think all the kits come with a pre-drilled hole through to the post for grounding, so have a look as you may need to drill it yourself.