Island A

Given that, I wouldn't expect duty stays much longer than 437 days or so
anyway. If a person is not going to stay for years and years, then I
don't see why we have to design for rotation. We know already that people
can survive a 437-day stay in microgravity and return safely to Earth. We
really don't need to make an orbital workshop any more complicated than it
minimally needs to be. Then let's say that one might expect the initial SPS construction workersto work duty shifts from a year to 400 days duration and then get rotated back to Earth. Than at a later point, after accumulation of significant experience in space construction, we might expect a newer SMF with large, rotating crew quarters or perhaps even an Island 1 in order to reduce transportation costs by extending duty shifts to several years. Of course Island 1 offers the prospect of reducing "commuting costs" to essentially 0 by providing the option of having workers who live in space full time. But I think everyone's in agreement that Island 1 won't get built at the onset of the program, and even O'Neill agreed with this point.