@AJ No, it's actually 'shallower' the closer you get to the 'end' XD
So, near the doors there's more sand needed than near the fence, but it's still a lot more than expected XD
Sand is about 40 euro per m3, so I'm expecting to go another 200 over the expected costs... not too bad, but it's another 200 euro I can't spend on new hoodies, games, books or a coffee machine :P