Mom had been doing some research on how to help Mike gain some independence.
For example he can stand up to eat but mostly if mom puts a hand under him to keep him from falling over. She had seen a few things online and contacted a local plastics company for help.
Mike's new tunnel:
It is made from acrylic and is heavy enough he can't tip it over. The box has to be in there for now since mom "might" have gotten the dimensions wrong. She also needs to rig something across the front so he doesn't fall out.
But....it will help him stand up while giving him enough room to wobble some and build up his muscles.