I've made a fair amount of progress and thought I'd share with TDH.
First, the main reference: the Gentle Giant statue.
Abdomen and cod
Thighs and plastic belt
Right forearm and bicep
The helmet - before conversion
With the mask
And that's all for now. After I reassemble my left forearm, I'll start getting this thing strapped and wearable. Still need to paint and weather a few parts.