[jvanderbot]

Well size is the limiting factor for fliers, since they like to have broad surfaces with low weight. But I think you're referring to some, ahem,

untested possible landing vehicles ...

in which case, yeah, you have a lot of robots.

For the solar farm assembly case, It's actually a lot easier to have a teleoperated robot doing the work, a few astronauts in orbit doing the operation / construction. In the case of building things, you want as much space / weight landed to be the thing being built, not the builders, per se.