Repurposing furniture into humidor isn't the easiest way to go about this. If you have the tools and skill set to pull it off, you'd likely already have it done.
Couple questions and suggestions.
1 - where do you live? I.e. do you need temperature control? Is it humid or dry in your home?
2 - how many cigars do you want to have on hand? Also do you mostly buy singles / 5packs or do you buy mostly by the box?
My suggestion if you want a nice display humidor is to buy a nice display humidor. Not the cheap China humidors, but a well made one. Yes it's expensive, but it will work, and the finish is much more durable than the cheapos. If you buy by the box, then an end table humidor or tower.
Alternatively you could do a wineador. If you live in a hot area this is perfect as you can also control your temperature. Looks decent, but depending on placement and decor, an appliance may not have the ideal aesthetic.
Or keep it out of view and have something cheap that works, with a cooler. Keep one of your small desktops stocked, all the overflow in the cooler. Or Tupperware if your temperatures don't fluctuate much. Just make sure you use proper 2 way humidification system like Heartfelt beads or Bovedas.