Modeled the lens carrier.  It mounts with 4 screws on the corners to allow for final focusing.

The extended cylinders are to prevent light from leaking between the projection images.

I'm still undecided if this should be the actual front face/aperture or not.  It will print flat like this with the outside surface against the bed, so that may look nicer in the end.

I can mount also this two ways.  

• Screws through the body based aperture, through springs, and threading into this.
• Screws through this as the front/real aperture, through springs, and threading into the body.

The lenses should really be allowed to be full size for maximum brightness, but the scale aperture size from the show has them smaller.  

So... should I sacrifice brightness for scale perfection?  Um.... No.

I think I'll just model a properly scaled cover for people want to be perfectly true to scale.

Moving on to the image ring mounts/drive.