Go to the BP_MasterBuildPart and create a new variable called GridComponents and set it to BP_GridComponent type, then set it to an array.

Go to the BP_MasterBuildPart and create a new variable called BuildCollisionComponents and set it to Primitive Component type, then set it to an array.

Next copy the videos below.

Then compile the BP_SGKBuildingInterface and go back to the BP_MasterBuildPart and compile it then copy the video below.

Add the highlighted nodes shown in the image below, location at the top of the image.

Go to the location shown below and create a new custom event called ClientTraces and copy the image below.