Tom, I made a wing rack that is exactly like the one Ryan showed us in his picture. IMO you can't go wrong with that set up for wings of any size, and it's relatively inexpensive to make too.
As for my big birds, I'll do my best to describe without pictures....
I use those large stamped sheet steel shelf brackets. For each model, I position two of them on the wall, the same distance apart as the distance between the main wheels and the tailwheel. Then I screw a piece of plywood onto the top of each bracket that's about 6" wide, and sticks out from the wall far enough on the one bracket to place the main wheels onto. The plywood on the other bracket sticks out far enough to place the tailwheel onto. I position the model onto the two narrow shelves, main wheels on one, and tailwheel on the other. Then I glue little chocks onto the shelf in front and behind the main wheels to prevent the model from rolling off the shelf, as it's only 6" wide!
If you want to avoid flat spots on the tires from prolonged storage...instead of chocks, glue small 3/16" plywood plates onto the shelf, on edge either side of the wheels with notches on the top edges for the axles to drop into...again so that the model doesn't roll or slide off the shelf.
I have three big birds stored from floor to ceiling this way. They are positoned with the tails up, in flying attitude, and in the space between the fuselages, I keep the two piece wings and wing struts for each model on miniature versions of the racks in Ryan's picture. It's nice and tidy, inexpensive, and easy to to.

I hope my description makes sense, and is usefull to someone!

Cheers, Nigel