Apologies again for the long wait between updates. Who knew having a kid would take so much time?
(I kid, I kid)
I've got an inner dome modeled, mostly for scale. I may just have one printed anyway; I'm horrendous when it comes to making anything circular and it wouldn't be any more complicated than anything else in this build.
From another angle, which shows a bit of the interfacing I've added.
I also added a small mounting area for the speaker that will be a part of the electronics kit for the thing. Again, if anyone could help me make something in Eagle or a similar PCB layout program, I have the component and wiring diagram done and all it needs is to be plugged in and optimized for space.
Right now my plan is to use a motor with a model kit wheel glued to it to propel the inner cylinder, which will be mounted to the phone cord detangler as seen in other builds. That will plug into the female plug from a phone wall jack, easily found in any hardware store, as shown below. I was thinking of using gears but I don't really have any on hand, though I could try to model them, I suppose.