I’m familiar with kapton. My comment was more in regards to the shrink wrap not completely covering cell. But it’s good that you plan to use fish paper. I hadn’t noticed it in the pic. My bad!
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Its a bit unusual, I know 
I’m reusing cells from two NESE compression pack batteries and for those I had cut the shrink at the negative side to prevent cutting pieces of it when pushing them in 
balance wires looking niooooce
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How not to build batteries
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uuu that is not looking nice
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that’s a guaranteed fire ball
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I would be worried about series current running through these spots
Edit: if the tabs from your cells ran all the way to the other side of your busbar strip it would be a lot better
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For piece of mind i think that is the safest bet 
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I like to dremel my nickel strip a little before I solder, really helps with the solder sticking
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Add 2 more on each side? For redundancy? 
I make score marks with a exacto knife.
@Flasher mabye
But hell thats a little over kill for a 12s3p
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Also, that copper braid looks pretty soldered… looks like it would be pretty much stiff… kinda defeats the purpose of using it
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Its tinned so thats how it looks, its semi flexible in its current states.
The middle does look a little rough but still flexes so 
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Th danger of soldering too much is it makes the fine threads of the braid brittle and prone to breaking with repeated flex
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If this is to a somewhat flexible battery you will have problems as time goes on, the braid is soaked in solder, so it can break after a while
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Its not a flexible pack so there shouldnt be any problems, its going into a tayto.
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