Is this a design request?
What diameter sphere do you want.
Will a glass filled nylon frame be light and strong enough?
What’s the hardware budget?
My services are free for fun stuff like this.
I can just make you something custom and ultralight with my 3d printer and soldering Iron.
I’m a full end to end hardware and Software designer.
This is the spherical ws2812 display device I’m building on my desk right now.