Head: VvV Dr. Mindbender
Torso: JvC Tunnel Rat
Arms: Beachhead 2002
Legs: Recondo 2002
Chainsaw: Stikfas Fireman
Diorama: Buzzer diorama from www.diodrama.co.uk

I thought Buzzer was the best Drednok and the 1984 figure didn't do him justice.