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I used those sizes intentionally because they convert well and didn’t have to make multiple versions just to change bolt holes. M8 and M3.5 fit very well. I know M3.5 isn’t the most common metric size but if my local US hardware store has them I assume you can get them everywhere. This is used world wide and I want to make it as easy as it can be. I actually do all my designing in metric, but metric hardware around here is at least triple the price of imperial.
So when I made/released this I didn’t know it would be so well received. It was just a weekend project for me. Redesigns are being made to better accommodate the rest of the world, not just myself.