I have the piece mounted on a foam board, with a gold lame backing. It turned out reasonably straight, so I think it is ok to finish it in a frame, behind glass. One thing I've learned is at this point, to position it vertically and let it settle for several days, and then re-pin and really finish the piece. I learned that the hard way; one other piece developed a sagging bubble after a week or so.
I will order the frame after I finish lacing the piece. Much as I dislike a cliche, a black bamboo frame looks good with it.