Make a backup of your project before following!

Go to the E_BuildType and click the New button and name the new entry DoubleDoor then save.

Go to the Grids folder and duplicate the BP_DoorGrid and call it BP_DoubleDoorGrid and open the blueprint.

In the BP_DoubleDoorGrid class defaults set the Grid Type to DoubleDoor and save.

Go to the BP_GridManager and copy the video below.

Next go to the BP_SGKGridClasses and copy the video below.

Go to the Blueprints/BuildParts/Wood and duplicate the BP_WoodDoorFrame and call it BP_WoodDoubleDoorFrame

Go to the Blueprints/BuildParts/Wood and duplicate the BP_WoodDoor and call it BP_WoodDoubleDoor

Go to the Blueprints/BuildParts/Stone and duplicate the BP_StoneDoorFrame and call it BP_StoneDoubleDoorFrame

Go to the Blueprints/BuildParts/Metal and duplicate the BP_MetalDoorFrame and call it BP_MetalDoubleDoorFrame

Next go to the BP_GridComponent and select the PresetGridSizes variable and add the setting shown in the image below, to add a new entry click the small + button.

Go to the BuildPartList and copy the videos below.

Go to the Blueprints/Widgets folder and duplicate the BP_BuildingMenuPageTwo widget and call it BP_BuildingMenuPageThree. (If you have customized your build menus then you can ignore this but you will have to add both the double door and double door frames build part segments to your custom build menus)

Next go to the BP_CodeLock blueprint and copy the video below.

Then go to the BP_PlayerBuildingComponent and copy the video below, location at the top of the video.

Go to the BuildPartList and copy the video below.

Next click the save all button in the content browsers and close the project.

Download the files linked below and unzip them.

https://www.dropbox.com/s/h6fdh417ilipth8/DoubleDoor.zip?dl=0

Then copy the video below

NOTE – If you have customized your radial build menus then delete the widgets folder from the downloaded files. Remember you will have to manually add the double door and double door frame build parts to your build menus if your do this. There is a video on the radial menu in the documentation that shows how to do this.

You can now open the project and you will find the double doors and double door frame on page 2 of the radial build menu when holding the building plan item.