For me, if I get this figure, it will only be for customisation. Here's what I'll do if I decide to get one (or hopefully I can get some parts from whoever decides to split the figure up into parts if sellers treat this like they do the Hot Toys releases).
KP02 body. (Much more accurately sized / proportioned for Vader).
Sideshow ANH Vader body suit. (FAR superior to the new one and we already know that it works perfectly with the KP02 body).
Sideshow ANH Vader codpiece.
Sideshow ANH Vader mask with Hasbro dome replacement.
Sideshow ANH chest box.
Sideshow ESB / ROTJ belt boxes and buckle.
Sideshow ESB / ROTJ inner robe and cape.
Sideshow ESB / ROTJ shin guards and boots.
Sideshow ESB / ROTJ chest armor (with some black dry brushed streaks over the silver parts to make it match the more weathered appearance of the original ANH armor).
Since my preference is for ANH Vader, I will use the ESB parts on my ANH Vader so it will have the inner robe worn OVER the chest armor rather than under it.
I think the height of the body on this new version is an awful disappointment as it's quite clearly way too big when compared to other normal sized figures. Yes, Vader was big but he wasn't as huge as Sideshow have made him here.
Agreed. Also my plan, although I have the ilforigno cape/tunic set.