Come to think of it, those corally connectors won't work the way they are intended to. Since the hole in the chassis is nearly as wide as the battery pack, the connectors won't be able to pass through that hole.
But someone mentioned laying the connector horizontaly between the cells at each end of the battery pack. That would work, just need a regular battery bar to jump from the connector to the cell terminal. Kinda complex, but maybe ideal.
A picture is worth a thousand words, see posts above and below!