I really like the idea of these, and think it's a great way to get some astromechs. That you included some R7 series droids is far more awesomeness than I expected.
I'm including a link below to a picture of some of the astromechs from this line. Was there no way to attach the legs without the gap between the body and the legs? I'm no toy expert, so I'm willing to believe I'm wrong, but it doesn't look like it would have been any more difficult to attach those without the gap than with. I'm hoping these are prototypes or that you otherwise suddenly realized there was a big gap there for no reason and decided it warranted a fix.
It just seems like there is such an easy fix preventing these from being much greater.