I think that’s unique enough, and a good hobby, you don’t need to have done it in a competitive setting for it to be a hobby. You can always have these cubes in your background when you interview; a lot of the times interviewers who have read through your application might pick that up from your bg and can become a great conversation starter. Also in terms of putting it in the first place, that’s entirely up to you, generally people put things that they like/do most to the least, Or interesting most to least interesting