If I were to attempt this with actual dolls, I'd want a second copy at the very least. I've considered rebodying my Trendmasters Cardcaptor Sakura dolls onto articulated, hard-plastic bodies like
this person did, but while I have multiple Sakuras, I've only got one each of Li and Meilin.
As far as my amigurumi goes, though? I've not only gone back and added pieces to get certain characters closer to what I was aiming for, but swapped entire heads on two thus far (Pavo to correct a serious structural mistake, and Sailor Mercury just out of dissatisfaction with her original head).
Also made an entirely new skirt (with help) for
this Gardevoir plush, but only because the original was
that crap.