Forgot to add- after I add the balance taps, I'll wrap the cells end to end to keep everything insulated and then two layers of shrink.

I'd estimate if I had everything needed to build these starting from a 36v DeWalt, I'd have a pr of batts ready to charge in 2 or 3 hours.

Soldering difficulty I'd place at maybe a touch more than average, but not much. Like I said earlier, if you can do deans, these won't be a prob. I would recommend nothing less than a 60watt iron though. I've just started using this 80watt Weller and I'm amazed by how quickly it will get the job done.