My design so far is incorporating a lot of short bus bar connections between contactors and multi post bus bars.
At first I was thinking of using the Blue Sea Link bus part, but it looks like they're all 3/8ths and I need 5/16th's.
One one hand, I'm a bit skittish about top balancing all in a row before assembling the pack, because I would rather have compression on them before taking them up to full charge. If I assemble in pack form, then I won't easily be able to parallel them with bus bars.
For a while I was leaning towards no bench supply, but now I'm considering that even if I don't top balance at first, I might want to have the ability to do some individual cell charging.
Instead of using temporary bus bars as shown in the video, I used wire to connect the cells in parallel. The amps passing through each connector wire was so low that I was able to use relatively low AWG wire leftover from a previous project.
EDIT: I installed my cells in the fixture in the same orientation I planned on using for the permanent series pack. By using temporary wires of equal length, I never had to remove the cells from the fixture to put them in series.
That's sort of what I'm thinking with a cell tap lead adapter, I could make one that used those wires to put it in parallel for top balancing, and that might make it more convenient to periodically rebalance. It would still require going in to remove all the bus bars though.