X2 what OFW said. Any way you could remove a section of brick in the run so the chickens could dig in the soil? If not, I'd go with the sand and straw. Just know you'll need to clean it out a lot, so don't get too many chickens for your space.
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@OrganicFarmWife
Yes the person who made the plans said it needed to rest on brick or cement. I think she also was trying to protect animals from coming in.
Is the brick mortar in? You could still keep the coop level and protected if you took the middle bricks out, leaving a foot of brick around the wall