I think we’re overthinking the problem. I’ve seen the issue for serving multiple beds pop up in numerous threads.
You want to keep the bot’s current accuracy, so you don’t want to mess with its current dimensions too much.
I have a simple solution. Place the entire bot on another rails.
Imagine the standard FarmBot Genesis, 3.0m * 1.5m. Let’s say the Y axis is the longer axis (3m) and the X axis is the short one.
Now instead of mounting this bot on a 3.0 * 1.5 bed, you mount it on a set of rails in the Y direction. Then you can place beds of equal dimensions next to each other (their long sides touching). So now the bot can move internally within the XYZ space, but the entire bot can shift on the X axis towards the left and right.
The bot won’t lose its rigidity because we didn’t make it any bigger than it is now. It might lose some stability but we can tackle that by making the outer rails (the one that carries the whole bot) snap into place or lock it down with some pins or brakes.