The shell carried two comments arguing opposite things: the older made the case for a 64px inset and said 40px was too wide, the newer made the case for the 40px the code uses. The older one had also drifted from the code independently - it described 68px sides and a 424px column while the file used --sz-64px, a 432px column.
One comment now: 40px sides, a 480px column, the measure the connect sequence is drawn to and which the arc shares. The earlier objection is kept and marked untested, with a note that if step 1 or step 3 reads loose the fix belongs in those steps' content rather than the shared shell.
Comment-only; no behaviour change.
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