Alright! New Information!

I noticed that the system still doesn't like landfill, so I kept an eye on it when it got stuck. New discovery, If there is a fish, it gets stuck. Once I noticed it, I tested it. I placed a small square of landfill over a patch of water with 2 fish. It proceeded according to plan, until it got to the fish. then stopped.

Need to remove the fish first, then place landfill, then structures.

Oh damn I spent so much time trying to deal with the fish! Will need to look at it again

Also, not sure if intended or not, but construction range for a standard turret is 64, as verifiable by constructing a line of belts out to the green border.

However, I noticed that Power and other repair turrets are construct-able out to double that.

That is indeed incorrect, only advanced turret should have double range for itself and power items

Also fish are no longer immortal behemoths blocking landfill :D

Excellent!