Quote - > Quote - Just my 2 cents worth ............... I'd rig him at normal Poser sizes then scale him up and tweak the joints for the scaled up figure.. save to library and you have your figure.

Ed
 

Why ?
hes a stand alone Genre specific figure
since he is NOT going to be a commercial item
Compatibility with existing poser content is NOT a concern

 

Easier to rig since you can use one of the existing rigs... Once you get him rigged you can scale him up... save to library... export obj then reuse the rig save to library again.. delete the old version
you have the larger figure
Ed