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Why would he go to all that effort, and then solder the batteries into place? A better solution would be a series of parallel (awesome wordplay!) slide-in bays, so the batteries could be hot- or cold-swapped. Then all he would need is a little health meter on the front of each, so he can see at a glance how each cell is doing.
What others have said is right, though. I wouldn't put this within 20m of my house. These mass-made, cheap quality 18650s can give off an extraordinary amount of energy when they let go. And the last thing you would want is for a catastrophic cascade with 4000+ of the suckers.
A concrete pad, in a ventilated tin shed away from the house, mounted on a non-conducting back-panel, sprayed in a fire-retardant coating. Then only connected to a separate circuit, running items I won't miss.
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