There's no rush.
I was impressed by the mathematical models (69 of them).
I also liked how the loaded objects look.
You did an excellent job!
Still, if you can't beat them, join them 
So I'll collaborate with you if you agree. 
Here is a temporary version you can use as a starting point.
My suggestions:
1. Delay rounding until later. The same issue arises with beveling. It works acceptably for now.
2. Please try to fix the texture issue with some shapes. Some appear to be lighted from the bottom up, but others look fine.
- Examples that don’t look right: cube, torus.
3. In my view, created (modeled) objects must remain solid at all times. I believe this means there should be no missing faces. The program must verify the correctness of the geometry, issue warnings, and not execute commands that would lead to this. Like on AOI.
4. The Outset and Inset buttons don’t do what they’re supposed to.
They perform a more efficient extrusion, which is fine and should be kept. But their basic function is also needed.
5. The Undo/Redo feature still requires extensive testing and improvements.
I'd prefer to discuss this further in private rather than in public (on the forum). My email address is public.
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A computer program does what you tell it to do, not what you want it to do. Murphy's Law
When all else fails, read the instructions. Murphy's Law
If you don't like "AS IS", DIY. Dorin's law
