It's as if a thousand Walets cried out in pain.
Seriously. they COULD do it, especialy with a little assistance from Hot toys. IF they did it, the easy method would be to make him imular to Kanamit. Make him all one piece. the armor would not need to be removeabale. just articulated ENough. IF they wanted to keep the cost down that is. Knee joints, ankle joints, wrist joints, forarm joints, elbow, shoulder, neck, etc. cover the joints with some mildly articulated armor, and it would not bee to tootaly different from jabba, and still Fairly poseable.
Personaly, I'd love a new Huge size body with a full costume, and complete articulation, but I really don;t see this happeneing. Not unless someone champions the task and makes him custom.
And if any of yuou guys know any hardcore SCA Armor smiths who like Fantasy armor, you might even be able to get his armor made in metal.
In all honesty, that really would not bee that hard to do. Sauron's armor is only somewhat complicated. it's a bit of an exagerated suit of German gothic 16th century armor, with some flare and acid etching.
Hell, before I quit Legends, I was in the process of designing a suit based off it ( minus all the spokes for safty reasons) For me to wear. We did not have alot of trouble scaling it down to my size ( the actor was HUGE) it's all just math. Kropsercle would probobly be a god place to start asking around.
That's not to say it wouldn't be expensive, but it can be done.