For us, we're happy for modules to get quite a bit bigger since the time it takes to build a bay (what we call one assembly of a few modules on a metal tube) is

For us, we're happy for modules to get quite a bit bigger since the time it takes to build a bay (what we call one assembly of a few modules on a metal tube) is approximately proportional to the number of modules, so bigger modules => fewer modules => faster build times. Our robot arms could handle much larger modules. For traditional human installation, we're already approaching the limit of reasonable module sizes -- today's modules take two people to lift and align.