The original hi poly Excalibur was done by a gentleman by the name of Stephen Davis. I can't find his url right now , but it should be in the readme that came with the mod. I think WZ included the url for the hi poly in his credits. If not try a web search or inquire over at the forums at
www.scifi-meshes.com . I know Mr. Davis frequents those forums.
Good Luck,
Scott