I don't believe Moser sells plans for their pieces. You might just have to experiment yourself until you come up with an accurate representation. Or, if your flush with cash Moser offers a resident in training program where for 2500 + the cost of the piece you can build along with one of their craftsman in the factory.
I believe Shamrock is right on this. Thos. Moser spends a lot of $ promoting his furniture and probably wouldn't be happy to have people doing a direct knock-off of one of his signature designs using plans.
Look at the picture of the piece and built something close but make it your own.