I really love the cooler master case idea, but instead of put it as a tiny desktop.
I would like to turn it into handheld with display that can be mounted to the Cooler Master case
and extendable battery case(s), so we can stack NOT only one, BUT multiple batteries.
Please make my dream a reality.
For the battery part, if it is too much of human hour.
An alternative simple solution could also help:
Having a Cooler Master sized battery case ready to be mounted.
When first battery is drained. we can just put the pc to hibernate, remove the battery case. and mount the second battery case. And turn the pc back on.