Questions on this build I am having done

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I'm having an addition added to the outside of a guest house in my backyard. it is an enclosure for cats to get into from inside the house it is called a catio for those who have never heard of it. this is what has been done so far by the contractor I hired. I have some concerns before he comes back to finish I have included pictures of what it looks like so far. I'm concerned about filling in the holes where the main posts go into the ground and several other things that may mainly be only l...