You'll also be able to estimate more accurately whether or not you have enough cope-stones (large stones placed on top of the wall) and throughstones (long stones that tie the two sides of the wall together).
When you reach the throughstones, set them on the far side of the line of copestones so you don't accidentally mix them in with the other large building stones.
Using the original foundation stones, or the biggest stones except for those that would make good throughstones, begin placing foundation stones into the foundation trench.
Llangollen's Judges Iolo Jones, of Deiniolen, and Vic Hollings, from Keighley, Yorkshire, assessed competitors on elements of wall building, from foundations to throughstones
, hearting, batter and coping.