The wings I'm trying to recreate are the ones shown here:

This was my first attempt to make them back in 2006 and I ran into MANY problems T^T

I'm sure it would've been easier if we made the wings a more "reasonable" size, but when have cosplayers every been reasonable? Anyway, besides the size I couldn't figure out how to keep them on our backs! For the Suu costume the wings were attached to a corset she wore under the top but the weight of the wings kept pulling it up and Oruha's had no support (unless you count the guy at the back holding them up 6_6U)
So my first question is for people with experience making wings, what is the best way to wear and support them?
Secondly, they were SO HEAVY that they were just the most uncomfortable things EVER!! I made them out of corplast which I figured would be light and durable but it didn't work out too well, I usually use paper mache but that'll probably be way heavier. My NEXT idea is to use either foam or wonderflex over a wire armature. And instead of using cardboard for the "feathers" I'm going to use vellum...
What do you think? Any suggestions, tips or ideas?