Well the bit in top of his head is a bit of putty to fill in a couple of holes cause it get a bit thin on top.The mouth piece is a bit of square styrene tubing cut down to fit his face
The putty will cost about $30 from your local autobahn and the styrene bits ive been getting from hobby habit i got a "odds & ends" pack from them which cost about $18 but gives you alot of different pieces