Official comment

Getting the horizontal shots needed to make a full 3D model of a structure come out properly requires some manual flying.
Image uploaded to Maps Made Easy do not have to all be from the same elevation but it helps keep the overlap organized.
When taking oblique images of the sides of structures it is important to include 45 degree shots of the sides as well and get plenty of overlap between them all.
As always, don't include shots that have any sky above the horizon in them.