I used the parts that the modkit gives you for the "Childhood Home" and built it! as you might notice there is no furniture that is because this is a base for you to make a completely custom childhood home and you can use it to help you build your maps!
To use this in your maps select 1 part of the house and it will highlight the whole house. Then right click the highlighted parts and press copy then go in your hello neighbor map and press CONTROL (ctrl) and V at the same time! It will paste the house in your map and you can use it how ever you want! (Permission is not needed to use this but I would greatly appreciate it)