My current Arthur Lives! project is a history of Arthur's early reign, focusing on his first three or four years. The first chapter is drafted. You can read it here.
Subsequent chapters will introduce Guenevere and Morgause, Excalibur and Pellinore, the Dolorous Stroke, Arthur's wedding, and the Round Table.
It feels really good to be doing this at last, although to others it probably looks like thankless drudge work. It really helps me get a full understanding of the medieval sources, and I start to see connections I never did before. For example, in the Battle of Bedegraine, one of the few casualties of note is the King of North Wales. But his death suddenly gives more depth to King Ryons, who subsequently becomes one of Arthur's immediate enemies. Because Ryons was also King of North Wales, so Arthur must have killed his father or brother.
But, predictably, it is slow and long work.