Not sure where to ask a building question?

Hi all, I’m not exactly sure where to ask this, so hopefully someone here can direct me. Is there a specific subreddit this would be best in?:

I’m in the midst of building a real life mystery box from COD zombies to gift an M4 to my husband. I know it’s being extra but I really wanted to also have it work in terms of making the gun rise when the song is activated lol. Any good ideas on how to go about this? I’m super stuck here so anything is awesome; I have a sound module inside the box that plays the music when I press a button so I was hoping there was something I could do to implement a rising action in a similar way. Thanks in advance for any ideas!