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So, I think we are the only team doing this, but we are actually using battery caps instead of spot welding. They're from a company called Vruzend and work kind of like lego's. They owner of the company Micah Toll has written a book on battery pack building and has a very popular Youtube channel on battery pack building.

We haven't finished testing our caps and won't be able to fully vouch for them until after it has undergone the rigors of the ASC. But it did significantly reduce the time it took to make our pack. Instead of spot welding each battery multiple times, we fully assembled our back in just a few hours.

If you haven't picked up a copy of Care and Repair of Advanced Composites, I'd say that's a good reference guide.

We always machined positive plug (MDF or High Density Foam) and built a negative mold (Fibreglass Reinforced Epoxy) from it. It's easier to sand a convex surface than to sand a concave surface.

Let me know if you want a more detailed description of what's involved... I was going to write something, but realized maybe you want to figure it out for yourself. :D

Edit: MDF or high density foam