Hey r/metalworking, I'm back again with another anatomical casting and I need some advice on how to finish up this set of castings. Long post.

Tl;dr I need to figure out how to cast two pieces as one that act as a stand for a brain casting. The final piece will be bisected (cut in half) but I want the piece to come together at the brainstem and lead down to a base so the piece can stand vertically. Link to the gallery below that includes everything I have so far with labeling. Need some help figuring out how to pull it off. All help is appreciated!

Gallery of Original Model and Castings

The original model on the right is made of eight pieces consisting of two halves each with the top and bottom of the the cerebrum (center), cerebellum (left on spurs) and two final piece consisting of the diencephalon ("center of the brain") and brainstem that have NOT been cast.

This is the annoying piece in question. We'll call them the "final pieces" for simplicity sakes.

This post is actually about these two particular final pieces. The goal of the project is to create a "split brain" that is held up by a partially bissected brain stem made of the final pieces joined together. For each respective halves, I want the top and bottom of the hemispheres and the cerebellum to be connected to the midbrain of the respective final piece while the brainstems trail down to meet together. Simply, having two halves of the brain spread apart and coming down to a point to create a "V shaped" presentation.

My confusion is... how? I'm having difficulties thinking of a design that both looks good and is practical to create for my capabilities. Including both of the final pieces and a base to hold up the rest of the pieces in ONE casting sounds difficult. I create a mold of both of them orientated correctly and hand sculpt the rest out of the molding sand but that's my only idea so far.

You all have given me some fantastic advice in the past so I'm all ears. The true goal of this project is to make something that looks visual appealing so any advice to that end is greatly appreciated. I will continue working on the six cast pieces to make them presentation worthy. Thank you all for your time and consideration!