Richard Bradley’s Seven Years War rules are designed for 15mm figures on a 40mm frontage.
Richard Bradley of the Tyneside Wargames Club offers a set of free wargames rules for the Seven Years War. The rules are designed for 15mm figures, where a battalion is represented by 3-4 bases.
Beyond the Saale is a set of campaign rules for the Seven Years War.
Gross Jagersdorf is a free board game of the August 30, 1757 battle between the Russians and Prussians in the Seven Years War.
Fr. Aelred Glidden offers a set of fast play rules for the Seven Years War. I miss reading his articles in the now lamented MWAN magazine.