HELP FOR BUILDING.

yo i have the TECHNIC senna gtr 42123 and huracan technica 42161. iv been building various stuff out of these parts like grapnel gun from arkham, 3 variants of a iron man forearm with mechanisms. im looking forward for the iron man exo but my builds are weak as in too many parts and no support. so if anyone can just build an exoskeleton with proper movement for joints, from the bicep to the wrist thats it. using only these parts please. or even a sketch. would be appriciated. cheers ...