The hot glue gets hard very fast and when i tried to glue the second row to the first row it was not completely straight. I had to use force to separate the batteries again and tore off some of the heat shrink from a few batteries.
I continued gluing the rows together first and then just placed them where they should go and tried to fill the holes between the batteries. This was no good because the surface area of the glue was too small and it was very messy. You can see it from the 2nd to 3rd row.
I then just placed the pack in front of me, prepared the row so i can just flip it up to the pack, quickly put some hot glue on it and then flipped it up and pressed it to the pack. This worked quite well.
So the pack is ready for welding now.
I just glued the triangle pack together with hot glue. I was scared somtimes that the nozzle could burn trough the insulation when i glued the strips in the jig. This was luckily not the case tough.