Use a shadow box frame 12″x12″. Plan on attaching everything to the cardboard included or a piece cut to fit.
First attach the neckerchief points to the center; and then start attaching the other items. You may need to experiment with your method of attaching.. if all else fails use some clear quilting thread and sew the items through the back drop.
photo via pinterest – not credited. Let me know if you know who came up with this awesome idea.
Do It And How 
Hi! My sister found your post and emailed me. I am the original pinner of this keepsake frame, which I made for my son as his Crossover present when he crossed over from Cub Scouts to Boy Scouts. The orignal pin is here – http://www.pinterest.com/pin/146718900333631133/. The frame is actually a 16×20. I have a blog and never posted a tutorial, but your post has inspired me to do so! 🙂