They are awfully fun to make, but have a very short shelf-life. The cream-filled puffs begin to soften from the cream very quickly. I don't think they'd be a good product for a retail setting; perhaps it would work by special order if you can deliver very close to the serving time.
We do them at Christmas since they look very like a Christmas tree. They cannot be done terrible far in advance. You need to crisp the choux for quite some time, and eat within 10 hrs of preparing. A Piece Montee made of macarons is much more pastry chef friendly.
I was asked if I would do one last year and never got to do it. kinda bummed me out. I think that I will do one just for kicks and keep it as a display for a while in my studio window.
I just don't know if I would do it with the spun sugar around it or use chocolate to "glue" it together.
My kids would love it though. 
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