Looks nice! I was thinking about doing some type of pit setup but wasn't sure if it would cramp the working room. You have to be SUPER carefull with the size. If its too much a inspector WILL ask you to take it down!
We had this happen and its a real bummer. Although looking at your design i don't think you will have that problem. Still be carefull though... You might want to think of some type of working frame so you can lift up the robot and do work under it.