No, not my guide. ;) A guide to crafting just one of the legendary greatswords -- Sunrise -- popped up in a Reddit thread today (click image to see bigger version). Reading the Reddit thread, it looks like a LOT of work/mats/gold to get a legendary. For the other legendary greatsword -- Twilight -- another person posted a guide in document form.
Here's another more generic chart of the process, from this thread on Reddit. The thread itself has more good discussion about strategies for getting the mats. (Click to see larger image.)
» Edited on: 2012-09-17 10:29:58