Not exactly King Arthur but I thought the maps were attractive enough to share.

https://medium.com/@callum.ogden/making-a-map-of-scotland-lord-of-the-rings-style-aefa960e6dfd
https://i.redd.it/5oyjlrnktwaz.png

Original Reddit Link where I came across the maps: https://www.reddit.com/r/Scotland/comments/6omq27/map_of_scotland_lord_of_the_rings_the_hobbit_style/

Ysgarran.

Edit: Not my work; just found while browsing reddit.

It looks very nice. I will have to take time to go over what you did in detail, but I like it.