I like your take on it, but it's been done in a game called Cosmos Camelot. I can't post links yet, but it's on drivethrurpg and the webpages are out there. I bought the bundle and it's pretty good; I'd bought it mainly because it's Fate-based.
I like your take on Aurthurian adventures in space, but as a formal product, it's already been done:
(can't post links yet) w w w .rpgnow.com/product/101297/Camelot-Cosmos-GMs-Book?src=s_pi
I bought the CC bundle a while ago and it's pretty good -- very complete as the mythos goes. It's...