Ok, I modified your working file to add
"littlebird": {
"Sound on purchase": true,
"Order": 20,
"Show": true,
"Name": "littlebird",
"Prefab": "assets/custom/littlebird.prefab",
"Image link": "https://i.postimg.cc/gJCY3HcY/Littlebird1.jpg",
"Spawn distance": 5.0,
"Fuel": 100,
"Currency: 0 - item, 1 - Economics, 2 - Server Rewards": 0,
"If vehicle selling for item type him shortname": "scrap",
"Price": 1500,
"Skin": 3304630260,
"Command": "littlebird.add",
"DeployableItemId": 833533164,
"Need add engine parts if it possible?": false,
"Engine parts": null,
"Pickup type (0 - command, 1 - hammer)": 0,
"Can pickup?": true,
"Can recall?": true,
"Recall price": 0,
"Recall cost need?": false,
"Pickup price": 0,
"Enable decay?": false,
"Permission (still empty if not need) ex. vehiclebuy.YOURPERMISSIONNAME": null,
"Maximum number of purchases of one vehicle by one player": 0
}
It shows up in the list, and I can buy one, but when I place the "box", it just remains a box. Minicopter works fine as a comparison. Any ideas?