Jointing Midriff joint, so hips can SHMOOVE

First, looks awesome in general!! I love following this project, you are doing great!!

A 3-part torso is somewhat common. Not the standard, but lots of companies and artist's dolls do have them! The one that comes to mind first is Bimong. I highly recommend scrolling through these pictures (and people's photos of Bimong bodies... they are so beautifully complex!!) and looking at the posing and how the joints interact

There are a lot of examples of each part stacking onto the other, with a little overlap (see picture). I can't think of a good example of someone doing a joint inside the other two sections, but I also can't think of a down side to it. FL Minifees kind of have it, but their proportions are different. You might be a bit more limited on side to side twists, if that makes sense. Like, feet and legs facing forward, but upper body turned in a different direction. The internal joint might constrain that, but I think it would depend heavily on the amount of overlap each section has.




Also!! I actually did remember a good internal joint with great mobility, check these pictures out: Elf Girl - Spirit Imprint
Here is a 5 minute long posing video, lots of great joint interactions!! (Here is a mirror if you don't have instagram)

 

Happy to help- I love talking about it all hahah.
I have a resin printer & will be done with current orders in about a month, so I am always willing to help if you'd like to iterate

 

First of all, this looks awesome! Congrats on your progress!!!

I don't know if you're still working on this, but if I may make a suggestion -- Maybe add notches? I have a doll like this and the notches really help hold the position. I'm afraid that if you leave it smooth, he may wiggle TOO much haha! I'd love to know if you've made further progress on this!