For my hobby projects i do the following.
I adopted the style of writing all macros in lower case with the prefix "macro_", so i can grep through all macros. So macro_ becomes like a keyword. Same with enum.
I use almost the same naming scheme for i32,f32, etc., but i typedef for example size_t const to usz, and size_t to usz_ (or use macro mut(x) x ## _) . So all shorter type names are const by default. I use a single header of 35 sloc to do that.
I see that this way of coding can be confusing for other people, so i avoid it when writing code that other people have to work with. But for personal code its really enjoyable for me.