Custom non-square viewport grids

Contributing to Blender
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I am making some equilateral triangle/hex grid tiles in this style:

image
image1920×1080 130 KB

In order to help with creating the girds, I had to make creative use of vertex snapping to assemble tessellated hexagon mesh, and write a script to bisect the faces to create an additional equilateral triangle grid.

This works well enough for the moment, but I would really like to make a plugin which replaces the normal 3D viewport grid with a dual hexagon/triangle grid, with snapping support.

I looked at this plugin:

But this plugin does not seem to implement a custom overlay.

I am new to blender’s plugin api, but comfortable with C++ and graphics programming.

Would someone be able to point me in the right direction for implementing a custom viewport grid?

Edit:

I have found the following documentation:

https://docs.blender.org/api/current/gpu.html

Which I think should get me most of the way there, which leaves the question of snapping, does the blender plugin API have any way to create custom snapping targets?

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This isn’t really about contributing to Blender itself, so I’m not sure this is the best place to chat about it, but the quick answer is no - the API doesn’t allow you to create custom snapping targets that will work with all the built-in transforms. But, you can create a new transform operator or tool that snaps to your custom grid.

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