Ive been working on this wall on and off for a little while now. Its just over 40metres long with a corner, 1.2ms high at roadside but built on a bank which was very steep in places so it varies between 1.5m and 1.3m on the bankside. Three diffent kinds of stone delivered (client was in charge of that) and used on three different sections but I dont think you notice.

Thin stone end

Bigger stone, corner and wall end

From bankside – cobbles are for the drive