Hi, here is a guide on how to automate your base expansion with concrete floor.
Drones will automatically flattern the tiles and place concrete on the top layer.

https://www.youtube.com/watch?v=tuNsS0da09w

Beacons:

• Parking - where your bots idle
  
• Fill Source - where bots should take tiles to fill working area
  
• Concrete-Working-Area - area where to place concrete. Will be placed automatically by surveyor.
  
• Concrete-Placement-Height - one beacon placed on the height 1 tile below your desired concrete level

Storage:

• Concrete-Storage - Storage with concrete items
  
• Drop-off - any storage for unused tiles

Actions:
1. Advertise - set item filter to concrete and set filter mode to exclude. Set size.
2. Place beacon - Role Concrete-Working-Area. When empty Delete. Set size.
3. Remember - Role Concrete-Working-Area to #
4. While (count of # > 0) Rest - rest until area is exist (it will be deleted when all tiles will be concrete)
5. GoTo your preferred direction
6. Play-Loop

You can customize area size and surveyor move direction.


Concrete-Work:
1. GoTo High Point of Concrete-Working-Area
1.1 On fail play Concrete-Park
2. If at same level Concrete-Placement-Height - Play Concrete-Place
3. If above Concrete-Placement-Height - Play Concrete-Dig
4. If below Concrete-Placement-Height - Play Concrete-Fill
5. Play-Loop

Concrete-Dig:
1. Dig
2. GoTo lowest point of Concrete-Working-Area
3. If below Concrete-Placement-Height - Deposit
4. On Fail
4.1 GoTo nearest Drop-off
4.2. Give
5. Play-Concrete-Work

Concrete-Fill:
1. Remember current position in #
2. GoTo nearest Fill-Source
2.1 On fail play Concrete-Park (In case there is no available Fill-Source roles)
3. Dig
4. GoTo #
5. If below Concrete-Placement-Height - Deposit.
5.1 On fail play Concrete-Park (in case if another drone already placed tile while current was looking for a source to fill)
6. Play-Concrete-Work

Concrete-Place:
1. Remember current position in #
2. GoTo nearest Concrete-Storage
2.1 On fail play Concrete-Park (in case storage not exists)
3. Take 1 concrete
3.1. On fail play Concrete-Park (in case no concrete is available)
4. GoTo #
5. If at same level Concrete-Placement-Height - Deposit
5.1. On fail play Concrete-Park (in case if another drone already placed concrete)
6. Play Concrete-Work

Concrete-Park:
1. If current storage size > 0
1.1 GoTo Drop-Off
1.2 Give
2. GoTo Parking
3. Rest
4. Play Concrete-Work

You can also manually copy Concrete-Working-Area and place it where you want. Using surveyors is not necessary.