Here is a quick pdf of a power point slide (my favorite design tool
).
Assuming the rule is 60" and the metric equivalent:
For a "long" oriented robot any arm can only extend about 18" from the front of the robot (not simply 22 = 60 - 38, due to the "cylinder").
For a "wide" oriented robot, any arm can only extend about 23" (again, not simply 32" = 60-28).
Add the bumpers and it is even more of a challenge.