I actually had a real-touch flower bouquet made by a local vendor here in Southern California and then flew with them, and then a family friend made our centerpieces for the wedding reception. Everything traveled extremely well, it's a matter of packing your florals correctly with enough cushion so they don't get flattened out. And then also the willingness to "fluff" them and fix them should you need to once you arrive to your destination. It's totally a great idea if your destination is a place that either doesn't carry the flowers you want or if they're simply too pricey. Also a good option if you want your flowers to look exactly how you envisioned. Surprisingly for me, having my flowers made was actually much more affordable and now I have wonderful keepsakes as well
Here's a photo of my bouquet ...