Discussion for Merging Immovable Objects with Map Geometry 
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This time round we've got another more advanced forging technique that follows on from the interlocking objects forging 101.
We'll start off by explaining how to push a double box into the ground - once that's explained it's a similar process to force any immovable objects into a wall or any other map geometry.
As an example, the double box in the first screenshot was forced into the ground to leave it 3 walls high above the floor. To do this, lay 3 walls flat on top of each other and then place the double box on top. Delete the walls so you have a floating double box. Now set the floating box to 'Place on Start: No' and assign it a long respawn time to give yourself time to complete the next steps. Start a new round and the double box will not yet have spawned - however, it's small blue dot representing it's spawn location will still be visible. Looking directly down at the floor above the spawn location, place another double box and lower it onto the ground.
Don't ever let go of this double box you are placing, or it will disappear in later steps. Press X twice to bring up the object menu and set the 'Run Time Minimum' for the double box to the 'Run Time Maximum'. This will cause the floating double box you placed earlier to instantly respawn and force the double box you are holding into the ground. Whilst still holding the double box, press start to bring up the menu, save, and then quit.
Restart forge and the double box will be merged with the ground. Now all that is left is to delete the 'pushing' double box resting atop it, et viola!
How far do you want the object in the ground/wall?
It depends how high you float your 'pushing' object off the ground. The space between the ground and the 'pushing' object is how much of the 'pushed' object will be left visible above ground. The same process applies for pushing objects into walls, except you have to go through the procedure at 90° to the floor.
The object comes out sideways or not straight, how do I make it straight?
Simple, use double boxes to keep it straight. Put some on all sides so it will go into the ground/wall perfectly straight.
The objects keep dissapearing when I let go!
Dont let go of it, instead press start, save your map and quit, when you load up your map again the object will be in the ground/wall.
Alternate Method: Using the Door Faster, easier and more precise
Place the object you want to merge and secure it with other immovable objects like in the other method. Spawn a door and place it upside-down on top of the box. You'll see it sink into the box about a third of the way. Once it has settled, grab the box and let go right away. The door will now push the box down into the floor. If you want the box deeper in the floor, grab the door again and let it go and it'll sink back into the box.
This method is much faster and easier than the save and quit method. You can also use the sides of the doors to make smaller adjustments. Use multiple doors at the same time to push objects evenly.
Merging objects with the ground in forge.
Linear Mode
