This base will easily survive for a long time Day 28+ if you continue to upgrade the walls, don't forget to repair as you fight! Add a couple layers of barbwire fences to buy you more time.
I would expand on this base by building two 4 block high walls (where I placed the lower blocks on the outside) at the front of each side of the base this forces the hordes into corridors.
Later you could build a 2nd level to fight from if they break through.
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