I've only made a few, and being a huge Gundam fan, that is what I used as source material;
-a human-scale Zaku heat-hawk (made from PVC tubing, machined aluminum parts, and a silicone rubber blade)
-a human-scale Zaku shield (this is the Gelgoog version from 0083 without punching spikes, machined from plexiglass with a delrin grip)
(the round brace in the last photo is to supplement the frail human wrist...)
-this one is from two sources: the new Gouf Custom arm weapon from 08th MS team, and one of the left-arm energy blades from the Armored Core video game (AC2, I think...) (made from various materials found around the shop; aluminum, abs, steel rod, etc.)
-finally, a human-scale Gundam MkII beam saber (components machined from aluminum)