I found this latter half of this process, drawing with the pen tool and making things 'join,' i.e. shadows drawing on top quite difficult. The part where you cut bits of shapes out with the scissors and joined it up just would not compute for me. Any tips would be greatly appreciated.
Anyway heres a brief overview and final product.
I chose the middle bottom as my reference to sketch and simplify.
I drew about 30 alternate drawings and this was the one I settled on.
From there I messed about with it until I got this, not at all an amazing effort but I gave it my best.