Help me with the qc for my giant robot

its a ragdoll and it doesn’t act like one
also its really big (just saying)
help would be much appreciated .

qc and stuff:

Your physmodel is only assigned to one bone.

I fixed it (the bone thing) and it still doesn’t work <:I

okay I ALMOST have it done but when I render it says
“cannot find bone ValueBiped.Bip1_Head1 for bbox”