The rules are slightly different for hardware in that readers aren't going to to be able to immediately try it like software, some essentially unique builds tha

The rules are slightly different for hardware in that readers aren't going to to be able to immediately try it like software, some essentially unique builds that nobody (statistically) is going to try come by sometimes, etc. A thing that doesn't yet exist can't be showhn, though. There's nothing stopping anyone from posting about unfinished things, they just can't be 'Show HN'.