This is my sf_skywalk fort its easy to build and it takes the normal amount of blocks

The whole fort whit 2 wall overseeying semi bunkers at the sides.

Backside off the (double) wall whit entrance.

Defensive bunker in mid terrain.

Shielded entrance.

The walkways

Side semi bunkers.
The wall is build by placing a square block behind the place where you want the wal to be. Then u place a plate against the block and walk against it until it is straight. then u place the block half way past the side of the block

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!@#$ photobucket!!!! weird resizer!!!