The smaller ships, lower down on the towers, could actually physically dock on the sturdier levels jutting out from the tower at odd angles. Interestingly, the docks were levelled out as steps on a circular staircase would be, allowing for multiple docking of smaller airships and room for envelope sizes without the absurdity of having airships docked side by side and having their filled envelopes pressing against one another… for the most part that was.