I'm thinking of wearing the Yuna costume I made for my friend for An05. We're pretty much the same size.
I can give you some advice on how to NOT screw up, like I did at AN05 with my FF Photoshoot (you're probably well aware of how I failed :P).
1: Have it in an open, well-circulated area, so as to allow light traffic to flow through, but not in a high traffic area. (My biggest mistake)
2: Find a map or layout of the con building. If you can't find that, trying describing where you want everyone to meet.
3: Timings. What day? What time? Tell them how long you want to make it.
4: You probably want to arrive 10 minutes before the planned start, just in case. (My other big mistake)
5: If you want, make a big banner. Something to let everyone know where exactly the shoot is being held. It even attracts people who didn't know about it to begin with.
Well, I hope this helps! Good luck! If I decide to dress as Yuna, I'll try and be there for sure!
P.S. Heki-chan, I'm a big fan! Your costume always look fantastic!