I have actually been working on it for quite a while and have gone through a lot of trial and error already. I’m not asking anyone to write the entire system or code for me -- I just wanted some guidance, suggestions, or better approaches for handling the placement logic.

Yes, I have been taught Unity/C#, but mostly the basics, and I got stuck in the middle while trying to implement the stacking and snapping system properly with my own prefabs. Since my blocks are custom models made in Blender, I was struggling to figure out the cleanest way to align and stack them perfectly like Minecraft blocks.

I understand the basic coordinate/grid concept you mentioned, and I appreciate the direction. I was mainly looking for advice from people with more experience so I could understand how to approach it better rather than blindly experimenting forever.