Dan,
A friend of mine built a wooden frame to the height he needed, and used the grid-style sheeting that you can get to cover fluorescent light fixtures. He slipped a wood arrow in each square hole. One grid was positioned high enough to be near the fletch, a second grid was positioned 3/4 of the way toward the tip, and a solid sheet at the bottom as a stop. I don't have a photo, and he is no longer living... but it really made a nice display.
For you shafting, how about a large diameter piece of PVC pipe cut long enough to cover the shafts. Mount the tube horizontally in the rafters, slide in the shafts, and they are protected AND supported to minimize warping.
Hope that helps...
Daryl