Hello Carl
When you get to sealing your pod to the slab, have a look for a " non setting mastic " rather than using silicon, silicon will set all the way through and eventually ( quicker than you might think ) when the slab expands and contracts the joint will fail and water will enter the pod, a non setting mastic skins on the surface but does not set all the way through.
Any movement in the slab / pod joint will stay sealed and waterproof.
From memory it is a little more expensive than silicon but better in the long run.
There are many on the market here is one at Bunnings.
https://www.bunnings.com.au/selleys-...alant_p1230169
Ed