Here's the lowdown:
15. 'Chain Flame'
Original box head with razor wire rim, metal marine, alternative backpack.
16. 'The Blind'
He's mainly chaos marine plastic, I think his knife is from elsewhere.
17. 'Screaming Jake'
Jake is made from parts of the zombies plastic box, certainly his head and standard are from there. There's some green stuff and guitar wire in the mix too. Metal shoulder pads.
The army is mostly silent, so Jake's is always a welcome wail amongst the forces :)
18. 'Mad eye'
Mostly metal with a plastic backpack
19. 'Bolter Boy'
The top half comes from the original plague marine box, with additional parts from the plastic chaos marine box.
20. 'Chainsword champion'
He's a metal champion with a plastic backpack
top half from original box and plastic parts. Guitar wire.