The pics in the reprint of a 1952 Star twin roadtest show what look like flexible tube, neatly down to each floatchamber.
Could be copper pipe though. No loops, whirls or anything, just down then across to a horizontal connection.
Probably cross-connected across to each other too, but that is not so visible.
What does the Parts Book show ?
It will detail each bit, and possibly even illustrate it...