Please note that I have not bothered filling in the gold quadrants of the shield. My failure to do so really annoyed the five-year-old. The quadrants are also not straight, but this is my rough draft for color placement.
In the interest of making this a viable project, I've cut down the number of colors. I think I will need yellow, gold, tawny and medium brown, red, brick, silver, grey and black. Some line detail in the helmet and lion as well as the tongue and claws I think I'll embroider in later on.
I'm still not sure about what material to use. Cotton really appeals as it's snuggly and washable, but doing intarsia with cotton, well, doesn't appeal at all. It would make a heavy fabric prone to unraveling.