Can order ready-made parcel delivery box from Lazada, Shopee or Taobao. Then insert into the front gate pillar. Trouble is to find those parcel boxes with the doors at the back. Most of the standard designs are more suitable for China or other country, where owners open from the frontage of the box.

https://shopee.com.my/product/493705937/130...PBoCtfQQAvD_BwE

For Malaysia, usually we prefer to open the box inside our gates and not front. I have found some suppliers from Taobao that offer multiple doors for the box. But, the shipping cost is not cheap. So, I decide to find a local supplier to fabricate.

You can take a look into this link https://item.taobao.com/item.htm?id=610683986163 for alternative design. If you order from Lazada or Shopee, I think those local sellers will do back-to-back orders to the respective Chinese sellers.

Standard design has one drawback i.e. to open the parcel dopping door, you have to pull down and leave the parcel on top of the door before closing. If the parcel delivery man open and forget to close appropriately, it could be a disaster when it rains. I have not completed my design. Probably will get a local supplier to draw a design that needs to lift the dropping door up in order to drop the parcel into the access hole.