Question New to Modding – Help with Creating a Custom Storage Item

[RosexMaryxStars]

I’m new to modding and am working on my first Stardew Valley mod with the help of SMAPI, Content Patcher, and Expanded Storage. I’m trying to create a custom End Table that has some functions like a storage chest, but with a few extra features. I’m hoping to get some guidance or suggestions on how to properly set it up.
Here’s what I’m trying to achieve:

1. Custom End Table – A furniture item that functions like a chest, allowing players to place it in their home and use it for storage.
2. 5 Inventory Slots – Similar to a chest, but with 5 slots for storing items.
3. Display Slot – I’d like the table to have an additional display slot where the player can place a decorative item (like the display in the in-game end tables).

So far, I’ve created the endtable.png and a content.json but I can’t seem to get the item to work. I’ve haven't been able to get it in the game, but I haven’t seen any errors in the SMAPI log, and I’m unsure if it’s functioning at all.

I've tried various approaches to get it in game but can’t seem to get it working. I’ve also checked the SMAPI console for errors, but there aren’t any red error messages, so I’m a bit lost as to where things might be going wrong.

Any advice or direction would be greatly appreciated! I’m still learning, so if there are any resources or tutorials that could help, please feel free to share them. Thank you so much for your time!