Yeah I love what you've done with yours. You gave me the inspiration to do it finally.
I plan on definitely replacing the body to make it 1:1.
There's a doll company that sells 30" toddler body doll kits, and head understructers in which to build upon your initial sculpt, but the dimensions of chucky's head and face are so different from what they give you to work off of. I figure it'd be easier just to start of the spencers head. Even if it is too small.
I planned on gutting all the features of the head, cutting both eye cavity's, brow and all, the entire mouth and chin, nose, ears, and starting from scratch. I just needed some kind of reference to work off of. But I didn't realize how truly smaller it was.