Oil Change and Filter problem.

[mrlmd1]

I haven't looked at the parts fiche for this area but you should check first before you lay it down (even though that sounds like a good idea to get access to the bottom of the bike) that the nut doesn't have room to drop down to the other side and get lost somewhere else. Seems to me it would be easier to get it out from the side. Have you tried those mechanical graspers with the prongs if you can fit one down the oil filler hole? If you were close by, I could use a fiberoptic scope to take a look in there and fish the nut out.