I have had turducken, and on comparing notes with a few (three) other folks i know who tried it on different occasions, our shared view was "nice, not an amazingly delicious dish, but a mildly noteworthy experience to have tried it."
I do understand its appeal as a set piece, and it sounds like that may be its appeal to your daughter for her celebration.
That said, while I enjoy trying new challenges in cooking, I would order a prepared turducken rather than attempt assembly myself. The challenge of deboning three separate fowls then combining them would not fit a category, for me, of repeat likely endeavors.
There is a market near me which I know prepares and ships them. I have previously bought from them a different item they offer, a fully boned whole chicken stuffed with one of three stuffings on offer - it was delectable, have had more than once, and simple to cook and serve. The turducken, due to sheer volume, may be a bit more tricky to cook completely without drying, but I have not tried.
If you are interested in a market shipping turducken prepared for cooking, beyond those you may have already found, please PM me.
