Board Thread:Questions and Answers/@comment-81.201.60.157-20130123151408/@comment-76.70.116.169-20130124183325

You need to right-click the landmarks.

Place the landmarks in a perfect rectangle along the gridlines and then right click any one of the landmarks, a red line will connect the four of them. Then place your quarry next to the red line, the construction lines should trace your red rectangle and pop off some or all of your landmarks.

The filler needs a three-dimensional rectangular prism unless you're using the 'flatten' pattern, or want a box that's 1-thick.