If they are that inept, maybe a full face helmet and visor would be the solution....
I like the design enough that I am considering building something similar for my garage and rolling it out when breaking in a new plane/engine. Have considered mounting it to one of those table saw dolly's that have levered brakes on the corner. One change I would make would be to reduce the benchtop to 1"x instead of the normal 2" ...saving weight. I doubt that it would have so much use that it would need the full strength of the 2" wood.