That was one of the first things I looked for when I got the car, knowing that the panelling would be going in at some point. There was a small amoutn of wter getting past the tail lights as they weren't done up very tight, but all is good now. Will send more pics through as work progresses.

Hy . You mentioned your tail lights, yes, there is a rubber seal between each tail light assembly and the body of the car, Make sure it is in one piece. If not, you can make new ones with rubber material, even inner tubes( car tires) ...work good(if not able to find the original seals or a piece of rubber big enough to cut a new seal )..., and make sure when tightening those small nuts, to do it in a cross pattern, as in bolting in lug nuts in a wheel, to make sure no water comes in.
About those bat cables, get a bean bag or something else and put the bat cables in it, those cables free flying around the trunk will chip off paint, you would be surprised to see how rust starts from those little nicks and scratches,add humidity(hot summer/wet winter)... rust is not welcome in a Datto.
Later____________________________

Once the false floor is in place, everything will have its own small compartment to fit into. Jack, toolkit, Jumper Cables, etc will all be safely secured, including the spare 5 litres of water I always carry around !!
I'll keep everyone posted with updated pics of the boot and doors as time progresses.

just out of interest, how much extra weight is going in doing this?

Once completed, the total extra weight will be about 8kg, 10kg at the absolute maximum in the boot. The custom panels that are being made to the doors will add (not including the speakers themselves) will add perhaps another 3-5kg. so 15 at the absolute total outside.

NIce work man. Must say...Is there any 120y out there without jumper leads in the boot? A must have aye. NOw I can see the difference in tail lights...check out mine.