What about building an electric guitar? I watch a lot of videos on the topic, and I think it would fit with the LTT style perfectly. Also, you'd probably catch the attention of quite a few people in the guitar community. Maybe even collab with a guitar channel like Burls Art, Darrell Braun Guitar, Jared Dines, samuraiguitarist, Music is Win, etc. if you want. Thanks for reading my suggestion. Love the videos!