I have learnt from previous experience with a plant pot and a huge hammer.
Its not what its built from but how its built. Robots like inertia dont saw holes they just sort of act like a lifter- makes a dent and flings it in the air. If its built well it wont break (but it will have a massive dint in it)
I am building a wooden robot and we will see how it does.
When it is built I will set someone the challange of breaking it.
I am quietly confident...